Publications from IISER Mohali
73) "Tris(aryl)cyclopropenium Ion as Organic Lewis Acid Catalyst in Carbonyl Activation Reactions"
Ranga, P. K.;# Fatma, S;# Athira, M. P.;# Archana, V.;# Ahmad, F.; Wadhave, A. B.; Kumar, V.; Saini, P.; Anand, R. V.*
# These authors contributed equally.
Chem. Asian J. 2025, e202500131. [Link]
(This article was included in Hot Topics in Organocatalysis) [Link]
72) "Copper Catalyzed 5-endo-dig Cyclization Cascade of 2-(2-Enynyl)pyridines with Boronic Acids: Access to Hetero-arylated Unsymmetrical Triarylmethanes"
Ahmad, F.; Fatma, S.; Ranga, P. K.; Anand, R. V.*
Prayogik Rasayan 2024, 8, 56 - 66. [Link]
(This article is published as a part of CRS Silver Medal Award Lecture 2024 organized by Chirantan Rasayan Sanstha)
71) "Bis(aminoalkyl)cyclopropenylidene (BAC)-Catalyzed Intramolecular Annulation of 2-(2-Formylaryl)-aryl-substituted p-Quinone Methides to 9-Phenanthrol Derivatives.
Ranga, P.; Ahmad, F.; Fatma, S.; Kumar, A.; Baranwal, D.; Anand, R. V.*
J. Org. Chem. 2024, 89, 16697 - 16710 [Link]
70) "Domino Approach to Heterocycles-Based Unsymmetrical Triarylmethanes through Heteroannulation of 2-(2-Enynyl)-pyridines with Enaminones"
Ahmad, F.; Ranga, P. A.; Fatma, S.; Anand, R. V.*
J. Org. Chem. 2024, 89, 12104 - 12117 [Link]
(This article is a part of a special issue celebrating the 25th anniversary of the Chemical Research Society of India [CRSI])
69) " A HMPA-H2O Mediated Oxygenative Carbocyclisation of 2-Alkenylphenyl-substituted p-Quinone methides to Indenones"
Fatma, S.; Ahmad, F.; Pankhade, Y. A.; Ranga, P. K.; Anand, R. V.*
Org. Biomol. Chem. 2024, 22, 5891 - 5896 [Link]
68) "Eosin Y Catalyzed Reductive Homocoupling of para-Quinone Methides Under Visible Light"
Rekha, Fatma, S.; Sharma, S.; Anand, R. V.*
Photochem. Photobiol. 2024, 100, 1078 - 1088 [Link]
(This article is part of a special issue dedicated to the topic "Photosciences in India")
67) "Cavity Catalysis of an Enantioselective Reaction Under Vibrational Strong Coupling"
Singh, J.; Garg, P.; Anand, R. V.; George, J.*
Chem. Eur. J. 2024, 30, e202400607 [Link]
66) "Cu(II)-Catalyzed [3+2]-Annulation of 2-Pyridinyl-substituted p-Quinone Methides with Enaminones: Access to Functionalized Indolizine Derivatives"
Ahmad, F.; Ranga, P. K.; Fatma, S.; Kumar, A.; Anand, R. V.*
Adv. Synth. Catal. 2023, 365, 3271 - 3276 [Link]
65) "Visible-light-mediated radical reactions of indoles with para-quinone methides using Eosin Y as an organophotoredox catalyst"
Rekha, Sharma, S.; Anand, R. V.*
Org. Biomol. Chem. 2023, 21, 6218 - 6224 [Link]
64) "Acid-catalysed intramolecular Friedel-Crafts annulation of hetero-atom-functionalized para-quinone methides: Access to O-, S- and N-based heterocycles"
Sharma, S.;# Singh, G.;# Rekha, Kumar, M.; Anand, R. V.*
[# These authors contributed equally]
Org. Biomol. Chem. 2023, 21, 5072 - 5078 [Link]
63) "Construction of Heterocyclo-fused Tetrahydrocarbazoles Through a Formal [3+3]-Annulation of 2-Indolylmethanols with para-Quinone Methides"
Singh, G.;# Sharma, S.;# Pandey, R.; Rekha, Anand, R. V.*
[# These authors contributed equally]
Org. Biomol. Chem. 2023, 21, 2493 - 2498 [Link]
62) "HBF4-Catalyzed 3,6-Bis-diarylmethylation of Carbazoles with para-Quinone Methides"
Rekha; Sharma, S.; Anand, R. V.*
Eur. J. Org. Chem. 2022, e202201323 [Link]
61) "Pd(II)-Catalyzed Annulation of Terminal Alkynes with 2-Pyridinyl-substituted p-Quinone Methides: Direct Access to Indolizines"
Ahmad, F.; Ranga, P. K.; Pankhade, Y. A.; Fatma, S.; Gouda, A.; Anand, R. V.*
Chem. Commun. 2022, 58, 13238 [Link]
60) "Reactions of Enaminones with para-Quinone Methides: Access to 4H-Chromene and 4H-Chromen-4-one Derivatives"
Singh, G.;# Sharma, S.;# Rekha, Pandey, R.; Singh, R.; Kumar, T.; Anand, R. V.*
(# These authors contributed equally)
Eur. J. Org. Chem. 2022, e202200792 [Link]
59) "TfOH-catalyzed Intramolecular Annulation of 2-(Aryl)-phenyl-substituted p-Quinone Methides Under Continuous-flow: Total Syntheses of Selaginpulvilin I and Isoselagintamarlin A"
Pankhade, Y. A.; Pandey, R.; Fatma, S.; Ahmad, F.; Anand, R. V.*
J. Org. Chem. 2022, 87, 3363 - 3377 [Link]
58) "Tropylium Salt-promoted Vinylogous Aza-Michael Addition of Carbamates to para-Quinone Methides: Elaboration to Diastereomerically Pure ∝,∝'-Diarylmethyl Carbamates" (Invited Article)
Rekha, Sharma, S.; Singh, G, Anand, R. V.*
ACS Org. Inorg. Au 2022, 2, 186 - 196. [Link]
57) "Recent Advances in the Organocatalytic Applications of Cyclopropene- and Cyclopropenium-based Small Molecules" (Invited Review Article)
Ranga, P. K.; Ahmad, F.; Singh, G.; Tyagi, A.; Anand, R. V.*
Org. Biomol. Chem. 2021, 19, 9541 - 9564 [Link]
56) "Construction of Oxygen- and Nitrogen-based Heterocycles from p-Quinone Methides" (Invited Review Article)
Singh, G.; Pandey, R.; Pankhade, Y. A.; Fatma, S.; Anand, R. V.*
Chem. Rec. 2021, 21, 4150 - 4173 [Link]
55) "A Base-Mediated Approach Towards Dihydrofuro[2,3-b]Benzofurans from 2-Nitrobenzofurans and 1,3-Dicarbonyls"
Singh, G.; Pandey, R.; Kurup, A. S.; Anand, R. V.*
Chem. Asian J. 2021, 16, 1271 - 1279 [Link]
54) "Bis(amino)cyclopropenium Ion as a Hydrogen-bond Donor Catalyst for 1,6-Conjugate Addition Reactions"
Ranga, P. K.; Ahmad, F.; Nager, P.; Rana, P. S.; Anand, R. V.*
J. Org. Chem. 2021, 86, 4994 - 5010 [Link]
53) "Base-mediated Sequential One-pot Approach for the Synthesis of 2,3-Disubstituted Indoles from 2-(Tosylamino)aryl-substituted para-Quinone Methides"
Pandey, R.; Singh, G.; Gour, V.; Anand, R. V.*
Tetrahedron 2021, 82, 131950. [Link]
52) "Base Mediated One-pot Synthesis of Oxygen Based Heterocycles from 2-Hydroxyphenyl-substituted para-Quinone Methides"
Singh, G.; Kumar, S.; Chowdhury, A; Anand, R. V.*
J. Org. Chem. 2019, 84, 15978. [Link]
51) "A Cascade Synthesis of Hetero-arylated Triarylmethanes Through a Double 5-endo-dig Cyclization Sequence"
Paluru, D. K.; Mahesh, S.; Ahmad, F.; Anand, R. V.*
Chem. Asian. J. 2019, 14, 4688. [Link]
[Invited article in the special issue, celebrating the 20th anniversary of the Chemical Research Society of India (CRSI)]
50) "Base Catalyzed 1,6-Conjugate Addition of Nitroalkanes to p-Quinone Methides under Continuous-Flow"
Pandey, R.; Anand, R. V.*
ACS Omega 2018, 3, 13967. [Link]
49) "1,6-Hydroolefination and Cascade Cyclization of p-Quinone Methides with Styrenes: Total Synthesis of (+/-)-Isopaucifloral"
Jadhav, A. S.; Pankhade, Y. A.; Hazra, R; Anand, R. V.*
J. Org. Chem. 2018, 83, 10107-10119 [Link]
48) "A One-pot Approach to 2,3-Diarylbenzo[b]furans Through N-Heterocyclic Carbene Catalyzed 1,6-Conjugate Addition Followed by Acid Mediated Dehydrative Cyclization"
Singh, G.; Goswami, P.; Sharma, S.; Anand, R. V.*
J. Org. Chem. 2018, 83, 10546-10554 [Link]
47) "Exploring Gold Catalysis in 1,6-Conjugate Addition/Domino Electrophilic Cyclization Cascade: Synthesis of Cyclohepta[b]indoles"
Jadhav, A. S.; Pankhade, Y. A.; Anand, R. V.*
J. Org. Chem. 2018, 83, 8615-8626 [Link]
46) "A Tandem One-pot Approach to Access 1,2,3-Triazole-fused Isoindolines through Cu-Catalyzed 1,6-Conjugate Addition of Me3SiN3 to p-Quinone Methides followed by Intramolecular Click Cycloaddition"
Jadhav, A. S.; Pankhade, Y. A.; Anand, R. V.*
J. Org. Chem. 2018, 83, 8596-8606 [Link]
45) "Bis(amino)cyclopropenylidene catalyzed Rauhut-Currier reaction between α,β-unsaturated carbonyl compounds and para-quinone methides"
Goswami, P.; Sharma, S.; Singh, G.; Anand, R. V.*
J. Org. Chem. 2018, 83, 4213. [Link]
44) "Exploring bis-(amino)cyclopropenylidene as a non-covalent Bronsted base catalyst in conjugate addition reactions"
Singh, G.; Goswami, P.; Anand, R. V.*
Org. Biomol. Chem. 2018, 16, 384. [Link]
[Part of a Themed issue "Synthetic Methodology in OBC"]
43) "B(C6F5)3 catalysed reduction of para-quinone methides and fuchsones to access unsymmetrical diaryl- and triarylmethanes: Elaboration to Beclobrate"
Mahesh, S.; Anand, R. V. *
Org. Biomol. Chem. 2017, 15, 8393. [Link]
42) "Synthesis of indolizine containing diaryl- and triarylmethanes through a Cu-catalyzed domino cyclization of 2-(2-enynyl)-pyridines"
Mahesh, S.; Paluru, D. K.; Ahmad, F.; Patil, S.; Kant, G.; Anand, R. V.*
Asian J. Org. Chem. 2017, 6, 1857. [Link]
41) "TfOH catalyzed 1,6-conjugate addition of thiols to para-quinone methides under continuous-flow conditions"
Jadhav, A. S.; Anand, R. V.*
Eur. J. Org. Chem. 2017, 3716 [Link]
40) "N-Heterocyclic carbene catalyzed 1,6-conjugate addition of Me3Si-CN to para-quinone methides and fuchsones: Access to α-arylated nitriles"
Goswami, P.; Singh, G; Anand, R. V.*
Org. Lett. 2017, 19, 1982. [Link]
39) "Cu-catalyzed hydrophosphonylation of 2-(2-enynyl)pyridines: Easy access to indolizine containing diarylmethylphosphonates"
Mahesh, S.; Anand, R. V.*
Eur. J. Org. Chem. 2017, 2698. [Link]
38) "1,6-Conjugate addition of Zinc alkyls to para-quinone methides in a continuous-flow Microreactor"
Jadhav, A. S.; Anand, R. V.*
Org. Biomol. Chem. 2017, 15, 56. [Link]
37) "B(C6F5)3 catalysed 1,6-conjugate allylation of para-quinone methides: Expedient access to allyl diarylmethanes"
Mahesh, S.; Kant, G.; Anand, R. V.*
RSC Adv. 2016, 6, 80718. [Link]
36) "Expedient Access to Unsymmetrical Triarylmethanes through N-Heterocyclic Carbene Catalysed 1,6-Conjugate Addition of 2-Naphthols to para-Quinone Methides"
Arde, P.; Anand, R. V.*
RSC Adv. 2016, 6, 77111 [Link]
35) "Bi(OTf)3 Catalyzed Solvent Free Approach to Unsymmetrical Diaryl(2-indolyl)methanes through 1,6-Conjugate Addition of 3-Substituted Indoles to para-Quinone Methides"
Goswami, P.; Anand, R. V.*
Chemistry Select 2016, 1, 2556. [Link]
34) "Furans to Benzofurans: Intramolecular Cross-Benzoin Reactions Catalyzed by N-Heterocyclic Carbenes"
Shirke, R.; Reddy, V.; Anand, R. V.; Ramasastry, S. S. V.*
Synthesis 2016, 48, 1865. [Link]
33) "N-Heterocyclic carbene catalysed 1,6-hydrophosphonylation of p-quninone methides and fuchsones: An atom economical route to unsymmetrical diaryl- and triarylmethyl phosphonates"
Arde, P; Anand, R. V.*
Org. Biomol. Chem. 2016, 14, 5550. [Link]
[Part of a Themed issue "New Talent"]
32) "Catalyst-controlled Regioselective Approach to 1-Aminoisoquinolines and/or 1-Aminoisoindolines through Aminative Domino Cyclization of 2-Alkynylbenzonitriles"
Reddy, V.; Jadhav, A. S.; Anand, R. V.*
Eur. J. Org. Chem. 2016, 453. [Link]
31) "Bis-(amino)cyclopropenylidene-Catalyzed 1,6-Conjugate Addition of Aromatic Aldehydes to p-Quinone Methides: Expedient Access to α,α’-Diarylated Ketones"
Ramanjaneyulu, B. T.; Mahesh, S.; Anand, R. V.*
Org. Lett. 2015, 17, 3952 [Link]
30) "An Expedient Access to Unsymmetrical Diaryindolylmethanes through Palladium Catalyzed Domino Electrophilic Cyclization - Extended Conjugate Addition Approach"
Reddy, V.; Anand, R. V.*
Org. Lett. 2015, 17, 3390 [Link]
29) "A Room-Temperature Protocol to Access Isoquinolines through Ag(I) Catalysed Annulation of o-(1-Alkynyl) arylaldehydes and Ketones with NH4OAc: Elaboration to Berberine and Palmatine."
Reddy, V.; Jadhav, A. S.; Anand, R. V.*
Org. Biomol. Chem. 2015, 13, 3732. [Link]
28) "N-Heterocyclic Carbene Catalyzed Highly Chemoselective Intermolecular Crossed Acyloin Condensation of Aromatic Aldehydes with Trifluoroacetaldehyde Ethyl Hemiacetal"
Ramanjaneyulu, B. T.; Mahesh, S.; Anand, R. V.*
Org. Lett., 2015, 17, 6. [Link]
27) "NHC Catalysed Trimethylsilylation of Terminal Alkynes and Indoles with Ruppert’s Reagent under Solvent Free Conditions"
Arde, P.; Reddy, V.; Anand, R. V.*
RSC Adv., 2014, 4, 49775. [Link]
26) "Direct Esterification of Aromatic Aldehydes with Tetraphenylphosphonium Bromide Under Oxidative N-Heterocyclic Carbene Catalysis"
Ramanjaneyulu, B. T.; Pareek, M.; Reddy, V. and Anand, R. V.*
Helv. Chimica. Acta. 2014, 97, 431. [Link]
25) "Base Mediated 5-endo-dig Cyclization of N-Propargyl-L-Proline Derivatives: A Facile Entry to Pyrrolizidine Scaffolds"
Mahesh, S.; Pareek, M.; Ramanjaneyulu, B. T.; Kaur, G. and Anand, R. V.*
Indian J. Chem., Sec. A 2013, 52A, 1086. [Link]
(Invited Article for a Special Issue "Complex Chemical Systems")
24) "Combining Oxidative N-Heterocyclic Carbene Catalysis with Click Chemistry: A Facile One-pot Approach to 1,2,3-Triazole Derivatives"
Anjaneyulu, B. T.; Reddy, V.; Arde, P.; Mahesh, S and Anand, R. V.*
Chem. Asian J. 2013, 8, 1489.[Link]
23) "Cinchona Alkaloid-Catalyzed Stereoselective Carbon-Carbon Bond Forming Reactions"
Babu, S. A.*: Anand, R. V.* and Ramasastry, S. S. V.*
Recent Patents on Catalysis, 2013, 2, 47. (Review Article) [Link]
22) "N-Heterocyclic Carbene Catalysed Aerobic Oxidation of Aromatic Aldehydes to Aryl Esters using Boronic Acids"
Arde, P.; Ramanjaneyulu, B. T.; Reddy, V.; Saxena, A, Anand R. V.*
Org. Biomol. Chem. 2012, 10, 848 [Link]
Publications from Dr Reddy's
21) "Synthesis of Valganciclovir Hydrochloride Congeners" Babu, K. S.; Rao, M. R.; Goverdhan, G.; Srinivas, P.; Reddy, P. P.; Venkateshwarulu, G.; Anand, R. V. Synthetic Commun. 2013, 43, 1751 [Link]
20) "A Concise Route to Valacyclovir Hydrochloride" Prasada Raju, V. N. K. V. V.; Ravindra V.; Mathad, V. T.; Reddy P. P.; Anand, R. V. Helv. Chim. Acta 2011,94, 592 [Link]
19) "A succinct synthesis of valganciclovir hydrochloride, a cytomegalovirus (CMV) retinitis inhibitor" Babu, K. S.; *Srinivas, P.; Madhavi, Y. V.; Babu, I.; Reddy, G. M.; Haldar, P.; Rao, P. N.; Krishna, V.; Srinivas, K.; Venkateshwarulu, B.; Reddy, P. P.; Anand, R. V.* ARKIVOC 2011, 199 [Link]
18) "Synthesis of related substances of Olmesartan medoxomil, an antihypertensive drug" Babu, K. S.;* Tagore, A. R.; Reddy, G. S.; Venkateshwarulu, G.; Reddy, P. P.; Anand, R. V.* ARKIVOC 2010, 292 [Link]
17) "An alternate synthesis of Leviteracetam" Mylavarapu, R.; Anand, R. V.; Kondiah, G. C. M.; Reddy, L. A.; Reddy, G. S.; Roy, A.; Bhattacharya, A.; Mukkanti, K.; Bandichhor, R.* Green Chem. Lett. Rev. 2010, 3, 225 [Link]
16) “Emerging trends in the synthesis of central core of HIV protease inhibitors” Bhattacharya, A.;* Bandichhor, R.;*Anand, R. V. Trends in Org. Chem., 2010, 14, 83-92 [Link]
15) “An expedient entry to fused [1,2,5]-triazepine derivatives: Extension to fused [1,2,5]-oxadiazine derivatives, a new class of 7-membered heterocycles” Reddy, G. S.; Kumar, P. A.; Anand, R. V.; Mukkanti, K.; Reddy, P. P* Synlett. 2009, 1463 [Link]
14) “Efficient synthesis of Olmesartan Medoxomil – An antihypertensive drug” Babu, K. S.; Reddy, M. S.; Tagore, A. R.; Reddy, G. S.; Sebastian, S.; Varma, M. S.; Venkateswarlu, G.; Bhattacharya, A.; Reddy, P. R.; Anand, R. V.* Synthetic Commun. 2009, 39, 291 [Link]
13) “Boric acid: An efficient and environmentally benign catalyst for transesterification of ethyl acetoacetate” Kondaiah, G. C. M.; Reddy, L. A.; Babu, K. S.; Gurav, V. M.; Huge, K. G.; Bandichhor, R.; Reddy, P. P.; Bhattacharya, A.; Anand, R. V.*Tetrahedron Lett. 2008, 49, 106 [Link]
12) “Expeditious Synthesis of Ramipril: an Angiotensin Converting Enzyme (ACE) Inhibitor” Kondaiah, G. C. M.; Gurav, V. M.; Reddy, L. A.; Babu, K. S.; Bhaskar, B. V.; Reddy, P. P.; Bhattacharya, A.; Anand, R. V.* Synthetic Commun. 2008, 38, 1737 [Link]
11) “An Investigation on Key Parameters that Influence the Resolution of Omeprazole Sodium” Reddy, L. A.; Kondaiah, G. C. M.; Babu, K. S.; Bhattacharya, A.; Bandichhor, R.; Himabindu, V.; Reddy, P. P.; Anand, R. V.* Org. Process Res. Dev. 2008, 12, 66 [Link]
10) “Effect of Solvent on Stereoselectivity in Pd/C (Type 39K)-Catalyzed Hydrogenation of Methyl 3-Oxo-4-aza-5-androstene-17-carboxylate, A Key Intermediate for Finasteride and Dutasteride” Babu, K. S.; Kolla, N.; Reddy L. A.; Kondaiah, G. C. M.; Anand, R. V.; Gandu, V.; Bhattacharya, A.; Reddy, P. P.; Bandichhor, R.* Org. Process Res. Dev. 2007, 11, 889 [Link]
Publications from Ph.D and Postdoctoral work
9)“Fragmentation of Nitrone Triflates to 9-Membered Rings” Murphy, J. A.;* Mahesh, M.; McPheators,G.; Anand, R. V.; McGuire T. M.; Kennedy, A. R. Org. Lett. 2007, 9, 3233 [Link]
8) “A Ring Closing Metathesis Approach Towards (+)-Diplodialide A” Anand, R. V.; Baktharaman, S.; Singh, V. K.* J. Org. Chem.2003, 68, 3356 [Link]
7) “Elaboration of a Baylis-Hillman Adduct to (-)-Acaterin and its Diastereomer Through Ring Closing Metathesis” Anand, R. V.; Baktharaman, S.; Singh, V. K.* Tetrahedron Lett. 2002, 43, 5393 [Link]
6) “Silica Gel Induced Cleavage of Aziridines with Aromatic Amines Under Solvent Free Conditions” Anand, R. V.; Pandey, G.; Singh, V. K.* Tetrahedron Lett. 2002, 43, 3975 [Link]
5) “Triphase Catalysis in Epoxidation of alpha,beta-Enones with Polymer Bound Quaternary Ammonium Salts” Anand, R. V.; Singh, V. K.* Synlett 2000, 807 [Link]
4) “Solvent Free Thioacetalization of Carbonyl Compounds Catalyzed by Cu(OTf)2-SiO2” Anand, R. V.; Saravanan, P.; Singh, V. K.* Synlett 1999, 415 [Link]
3) “Cu(OTf)2-SiO2 Catalyzed Trimethylsilyl Cyanide Addition to Carbonyl Compounds” Saravanan, P.; Anand, R. V.; Singh, V. K.* Tetrahedron Lett. 1998, 39, 3823 [Link]
2) “An Efficient Method for Deprotection of Acetals" Saravanan, P.; Chandresekhar, M.; Anand, R. V.; Singh, V. K.* Tetrahedron Lett. 1998, 39, 3091 [Link]
1) “The Unusual Behavior of Substituted 1-Aryl-2-(arylamino) ethanones Towards Vilsmeier Reagent” Majo, V. J.; Anand, R. V.; Perumal, P. T.* Indian Journal of Chemistry, 1999, 38B, 763 [Link]
Patents/Patent applications
1) “Method and composition for treating Osteoporosis” Rao, K. V. S.; Wani, M. R.; Manivel, V.; Parameswaran, P. S.; Singh, V. K.; Anand, R. V.; Desa, E.; Mishra, G. C.; Chatterji, A. US Patent US7335686 B2 [Application No.10/747,671] [Link]
2) “Molecules for inducing differentiation of dendritic cells" Chatterji, A.; Natarajan, K.; Manivel, V.; Rao, K.V.S.; parameswaran, P. S.; Singh, V. K.; Anand, R. V.; Desa, E. PCT Patent WO2005/037776 A1 [Link]
3) “Process for the preparation of Leveteracetam” Reddy, G. S.; Reddy, M. S.; Tagore, A. R.; Murthy, H. K. N.; R. Vijaya Anand, Bandichhor, R.; Kumar, M. R.; Sarma, K. R. J.; Surajmal, M. K.; Reddy, M. S. PCT Patent Application WO2008/077035 A2 [Link]
4) "Preparation of Valganciclovir and its salts" Reddy, P. P.; Anand, R. V.; Babu, I.; Babu, K. S.; Reddy, G. M.; Krishna, J.; Srinivas, P.; Madhavi, Y. V.; Haldar, P.; Krishna, V.; Rao, P. N.; Ravindra, V.; Satyanarayana, K.; Raju, V. V. N. K. V.; Suchitra, S. K.; Sakthivel, S.; Medisetti, R. K. V.; Manudhane, K. S. PCT Patent Application WO 2010/036904 A2 [Link]
5) "Process for the preparation of sitagliptin and pharmaceutically acceptable salts thereof" Reddy, P. P.; Babu, I.; Srinivas, P.; Shailaja, P.; Kavitha, N.; Anand, R. V.; Reddy, V. R. PCT Patent Application WO 2009/085990 [Link]
