1
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Kumar D, Unnikrishnan U, Kuram MR. Facile access to C-substituted piperazin-2-ones and mianserin derivative enabled by chemoselective carbene insertion and cyclization cascade. Chem Commun (Camb) 2024; 60:5691-5694. [PMID: 38726600 DOI: 10.1039/d4cc00959b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/29/2024]
Abstract
The chemoselective N-H insertion of unsymmetrical diamines into carbene is a longstanding challenge. A simple copper-catalyzed strategy for synthesizing C-substituted piperazinones is described, employing easily accessible diazo compounds and 1,2-diamines. The reaction proceeded via chemo-selective carbene insertion at the comparatively less nucleophilic amine, followed by instantaneous cyclization. The protocol was further extended to access NH-free piperazinone, and the synthesis of a Mianserin derivative.
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Affiliation(s)
- Dharmendra Kumar
- Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow 226031, India.
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Urmila Unnikrishnan
- Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow 226031, India.
| | - Malleswara Rao Kuram
- Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow 226031, India.
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
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2
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Splandesci M, Wróbel MZ, Madura ID, Dawidowski M. Ugi 5-center-4-component reaction of α-amino aldehydes and its application in synthesis of 2-oxopiperazines. Mol Divers 2024; 28:229-248. [PMID: 38104301 PMCID: PMC10876754 DOI: 10.1007/s11030-023-10760-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2023] [Accepted: 10/30/2023] [Indexed: 12/19/2023]
Abstract
A synthetic route leading to densely functionalized 2-oxopiperazines is presented. The strategy employs a 5-center-4-component variant of Ugi multicomponent reaction followed by a deprotection/cyclization sequence. N-Boc-α-amino aldehydes were used for the first time as carbonyl components in a key Ugi 5-center-4-component reaction (U-5C-4CR). It is shown that the presented synthetic route can lead to rigid, heterocyclic scaffolds, as demonstrated by the synthesis of tetrahydro-2H-pyrazino[1,2-a]pyrazine-3,6,9(4H)-trione β-turn mimetic and derivatives of 1,6-dioxooctahydropyrrolo[1,2-a]pyrazine and 3,8-dioxohexahydro-3H-oxazolo[3,4-a]pyrazine.
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Affiliation(s)
- Marta Splandesci
- Department of Drug Technology and Pharmaceutical Biotechnology, Faculty of Pharmacy, Medical University of Warsaw, Banacha 1, 02-097, Warsaw, Poland
| | - Martyna Z Wróbel
- Department of Drug Technology and Pharmaceutical Biotechnology, Faculty of Pharmacy, Medical University of Warsaw, Banacha 1, 02-097, Warsaw, Poland
| | - Izabela D Madura
- Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664, Warsaw, Poland
| | - Maciej Dawidowski
- Department of Drug Technology and Pharmaceutical Biotechnology, Faculty of Pharmacy, Medical University of Warsaw, Banacha 1, 02-097, Warsaw, Poland.
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3
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Nagar R, Suwalka D, Malviya BK, Verma VP, Jassal AK, Sharma S. Electrochemical Post-Ugi Cyclization for the Synthesis of Highly Functionalized Spirolactams. J Org Chem 2023; 88:13977-13994. [PMID: 37695028 DOI: 10.1021/acs.joc.3c01532] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/12/2023]
Abstract
The combination of the Ugi reaction and electro-organic synthesis can aid in the creation of novel heterocycles that have not been previously explored. In this study, a new strategy utilizing bis-amides from the Ugi reaction has been developed, which can produce C-S, C-Se, and C-C═O functionalized five-membered spirolactams mediated by electricity under catalyst- and metal-free conditions. Notably, this approach can be applied using a microelectro-flow reactor (μ-EFR) for gram-scale synthesis. The described strategy can synthesize complex azaspiro-fused tricyclic scaffolds with high diastereo- and regioselectivity, highlighting its versatility and potential.
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Affiliation(s)
- Riya Nagar
- Department of Chemistry, Mohanlal Sukhadia University, Udaipur 313001, India
| | - Dinesh Suwalka
- Department of Chemistry, Mohanlal Sukhadia University, Udaipur 313001, India
| | | | - Ved Prakash Verma
- Department of Chemistry, Banasthali University, Niwai-Jodhpuriya Road, Vanasthali 304022, India
| | - Amanpreet Kaur Jassal
- Department of Chemistry, U.G.C. Centre of Advance Studies in Chemistry, Guru Nanak Dev University, Amritsar 143005, India
| | - Siddharth Sharma
- Department of Chemistry, Mohanlal Sukhadia University, Udaipur 313001, India
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4
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Tripathi S, Kumar M, Shivhare A, Kant R, Deshmukh MM, Srivastava AK. Palladium(II)-Catalyzed Decarboxylative Difunctionalization of Alkynoic Acids To Access ( E)-β-Sulfonylacrylamides and DFT Study. Org Lett 2023; 25:6638-6642. [PMID: 37672675 DOI: 10.1021/acs.orglett.3c02415] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/08/2023]
Abstract
A palladium(II)-catalyzed regio- and stereoselective difunctionalization of alkynoic acids has been achieved using sodium sulfinates and isocyanides to synthesize (E)-β-sulfonylacrylamides. The reaction proceeds via decarboxylative isocyanide addition, followed by sulfonylation. This three-component process works well with aromatic, heteroaromatic, and aliphatic alkynoic acids with good functional group tolerance and excellent regio- and stereoselectivity. DFT calculations were carried out to explain the reaction mechanism and the stereoselective formation of (E)-β-sulfonylacrylamides.
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Affiliation(s)
- Shashank Tripathi
- Medicinal and Process Chemistry, CSIR-Central Drug Research Institute, Lucknow 226031, India
- AcSIR, Ghaziabad, 201002, India
| | - Monty Kumar
- Medicinal and Process Chemistry, CSIR-Central Drug Research Institute, Lucknow 226031, India
- AcSIR, Ghaziabad, 201002, India
| | - Ayush Shivhare
- Department of Chemistry, Dr. Harisingh Gour Vishwavidyalaya (A Central University), Sagar 470003, India
| | - Ruchir Kant
- Biochemistry & Structural Biology, CSIRCentral Drug Research Institute, Lucknow 226031 Uttar Pradesh, India
| | - Milind M Deshmukh
- Department of Chemistry, Dr. Harisingh Gour Vishwavidyalaya (A Central University), Sagar 470003, India
| | - Ajay Kumar Srivastava
- Medicinal and Process Chemistry, CSIR-Central Drug Research Institute, Lucknow 226031, India
- AcSIR, Ghaziabad, 201002, India
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5
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Tripathi S, Kumar M, Ambule MD, Saxena A, Kant R, Shukla SK, Srivastava AK. Stereodivergent Synthesis of ( Z)-/( E)-β-Sulfonylacrylamides via Tandem Difunctionalization of Alkynes with Sulfinates and Isocyanides. Org Lett 2022; 24:7632-7636. [PMID: 36222482 DOI: 10.1021/acs.orglett.2c03092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Stereoselective difunctionalizations of the terminal and internal alkynes with various sulfinates and isocyanides have been achieved to prepare (Z)-/(E)-β-sulfonylacrylamides. The (Z)-β-sulfonylacrylamides were generated via a one-pot process that involves the reaction of terminal alkynes with sulfinates and isocyanides in the presence of iodine in sequential manner. The (E)-β-sulfonylacrylamides were prepared in a two-step synthesis via palladium(II)-catalyzed addition of isocyanide to (E)-β-iodovinylsulfones synthesized from alkynes.
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Affiliation(s)
- Shashank Tripathi
- Medicinal and Process Chemistry Division, CSIR-CDRI, Lucknow 226031, India.,AcSIR, Ghaziabad 201002, India
| | - Monty Kumar
- Medicinal and Process Chemistry Division, CSIR-CDRI, Lucknow 226031, India.,AcSIR, Ghaziabad 201002, India
| | - Mayur D Ambule
- Medicinal and Process Chemistry Division, CSIR-CDRI, Lucknow 226031, India.,AcSIR, Ghaziabad 201002, India
| | - Ankit Saxena
- AcSIR, Ghaziabad 201002, India.,SAIF, CSIR-CDRI, Lucknow 226031, India
| | - Ruchir Kant
- Biochemistry & Structural Biology Division, CSIR-CDRI, Lucknow 226031, India
| | - Sanjeev K Shukla
- AcSIR, Ghaziabad 201002, India.,SAIF, CSIR-CDRI, Lucknow 226031, India
| | - Ajay Kumar Srivastava
- Medicinal and Process Chemistry Division, CSIR-CDRI, Lucknow 226031, India.,AcSIR, Ghaziabad 201002, India
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6
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Hooshmand SE, Yazdani H, Hulme C. Six‐Component Reactions and Beyond: The Nuts and Bolts. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | - Hossein Yazdani
- Independent researcher Independent Researcher Tehran IRAN (ISLAMIC REPUBLIC OF)
| | - Christopher Hulme
- The University of Arizona Department of Chemistry and Biochemistry Tucson UNITED STATES
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7
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Rastkar MB, Mohtat B, Marandi GB, Djahaniani H. A Convenient One-Pot Synthesis of 5-Aryl-N-cyclohexyl-1,3,4-oxadiazole-2-carboxamides via Aza-Wittig/Isocyanide-based Three-Component Reaction. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2022. [DOI: 10.1134/s1070428022070144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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8
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Seth A, Ghoshal A, Dewaker V, Rani A, Singh SP, Dutta M, Katiyar S, Singh SK, Rashid M, Wahajuddin M, Kar S, Srivastava AK. Discovery of 2,3-dihydro-1 H-pyrrolo[3,4- b]quinolin-1-one derivatives as possible antileishmanial agents. RSC Med Chem 2022; 13:746-760. [PMID: 35814931 PMCID: PMC9215122 DOI: 10.1039/d2md00078d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2022] [Accepted: 05/02/2022] [Indexed: 11/21/2022] Open
Abstract
A series of uniquely functionalized 2,3,-dihydro-1H-pyyrolo[3,4-b]quinolin-1-one derivatives were synthesized in one to two steps by utilizing a post-Ugi modification strategy and were evaluated for antileishmanial efficacy against visceral leishmaniasis (VL). Among the library compounds, compound 5m exhibited potential in vitro antileishmanial activity (CC50 = 65.11 μM, SI = 7.79, anti-amastigote IC50 = 8.36 μM). In vivo antileishmanial evaluation of 5m demonstrated 56.2% inhibition in liver and 61.1% inhibition in spleen parasite burden in infected Balb/c mice (12.5 mg kg-1, i.p.). In vitro pharmacokinetic study ascertained the stability of 5m in both simulated gastric fluid and simulated intestinal fluid. All the active compounds passed the PAINS filter and showed no toxicity in in silico predictions.
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Affiliation(s)
- Anuradha Seth
- Molecular Microbiology and Immunology Division, CSIR-Central Drug Research Institute Lucknow-226031 Uttar Pradesh India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad-201002 Uttar Pradesh India
| | - Anirban Ghoshal
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad-201002 Uttar Pradesh India
- Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute Lucknow-226031 Uttar Pradesh India
| | - Varun Dewaker
- Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute Lucknow-226031 Uttar Pradesh India
| | - Ankita Rani
- Molecular Microbiology and Immunology Division, CSIR-Central Drug Research Institute Lucknow-226031 Uttar Pradesh India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad-201002 Uttar Pradesh India
| | - Sangh Priya Singh
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad-201002 Uttar Pradesh India
- Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute Lucknow-226031 Uttar Pradesh India
| | - Mukul Dutta
- Molecular Microbiology and Immunology Division, CSIR-Central Drug Research Institute Lucknow-226031 Uttar Pradesh India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad-201002 Uttar Pradesh India
| | - Shivani Katiyar
- Molecular Microbiology and Immunology Division, CSIR-Central Drug Research Institute Lucknow-226031 Uttar Pradesh India
| | - Sandeep Kumar Singh
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad-201002 Uttar Pradesh India
- Pharmaceutics and Pharmacokinetics Division, CSIR-Central Drug Research Institute Lucknow-226031 Uttar Pradesh India
| | - Mamunur Rashid
- Pharmaceutics and Pharmacokinetics Division, CSIR-Central Drug Research Institute Lucknow-226031 Uttar Pradesh India
| | - Muhammad Wahajuddin
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad-201002 Uttar Pradesh India
- Pharmaceutics and Pharmacokinetics Division, CSIR-Central Drug Research Institute Lucknow-226031 Uttar Pradesh India
| | - Susanta Kar
- Molecular Microbiology and Immunology Division, CSIR-Central Drug Research Institute Lucknow-226031 Uttar Pradesh India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad-201002 Uttar Pradesh India
| | - Ajay Kumar Srivastava
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad-201002 Uttar Pradesh India
- Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute Lucknow-226031 Uttar Pradesh India
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9
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Yang ML, Pan HL, Kong HH, Ding MW. One-pot and divergent synthesis of polysubstituted quinolin-2(1 H)-ones and oxireno[2,3- c]quinolin-2(1a H,3 H,7b H)-ones via sequential Ugi/Knoevenagel condensation/hydrolysis and Ugi/Corey–Chaykovsky epoxidation reactions. Org Chem Front 2022. [DOI: 10.1039/d2qo01130a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new one-pot and divergent synthesis of multisubstituted quinolin-2(1H)-ones and oxireno[2,3-c]quinolin-2(1aH,3H,7bH)-ones was developed.
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Affiliation(s)
- Mao-Lin Yang
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Hubei International Scientific and Technological Cooperation Base of Pesticide and Green Synthesis, Central China Normal University, Wuhan 430079, P. R. China
| | - Hong-Ling Pan
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Hubei International Scientific and Technological Cooperation Base of Pesticide and Green Synthesis, Central China Normal University, Wuhan 430079, P. R. China
| | - Han-Han Kong
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Hubei International Scientific and Technological Cooperation Base of Pesticide and Green Synthesis, Central China Normal University, Wuhan 430079, P. R. China
| | - Ming-Wu Ding
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Hubei International Scientific and Technological Cooperation Base of Pesticide and Green Synthesis, Central China Normal University, Wuhan 430079, P. R. China
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10
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Wu J, Zhao L, Yang ML, Ding MW. Four-Component Synthesis of Polysubstituted Pyrazin-2(1 H)-ones through a Ugi/Staudinger/Aza-Wittig/Isomerization Sequence. J Org Chem 2021; 86:10755-10761. [PMID: 34251829 DOI: 10.1021/acs.joc.1c00735] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
A new efficient synthesis of polysubstituted pyrazin-2(1H)-ones via the sequential Ugi/Staudinger/aza-Wittig/isomerization reaction has been developed. The four-component Ugi reactions of arylglyoxals 1, primary amines 2, α-azidovinyl acids 3, and isocyanides 4 produced the azides 5, which were treated with triphenylphosphine to give pyrazin-2(1H)-ones 6 in good yields through domino Staudinger/aza-Wittig/isomerization reactions.
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Affiliation(s)
- Jing Wu
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Hubei International Scientific and Technological Cooperation Base of Pesticide and Green Synthesis, Central China Normal University, Wuhan 430079, P. R. China
| | - Long Zhao
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Hubei International Scientific and Technological Cooperation Base of Pesticide and Green Synthesis, Central China Normal University, Wuhan 430079, P. R. China
| | - Mao-Lin Yang
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Hubei International Scientific and Technological Cooperation Base of Pesticide and Green Synthesis, Central China Normal University, Wuhan 430079, P. R. China
| | - Ming-Wu Ding
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Hubei International Scientific and Technological Cooperation Base of Pesticide and Green Synthesis, Central China Normal University, Wuhan 430079, P. R. China
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11
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Ghoshal A, Ambule MD, Yadav A, Srivastava AK. Advances in Base‐Mediated Post‐Ugi Transformations via Peptidyl Anion Trapping. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202000648] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Anirban Ghoshal
- Medicinal and Process Chemistry Division CSIR-Central Drug Research Institute Lucknow 226031 Uttar Pradesh India
- Chemical Sciences Division Academy of Scientific and Innovative Research (AcSIR) Ghaziabad 201002 Uttar Pradesh India
| | - Mayur D. Ambule
- Medicinal and Process Chemistry Division CSIR-Central Drug Research Institute Lucknow 226031 Uttar Pradesh India
- Chemical Sciences Division Academy of Scientific and Innovative Research (AcSIR) Ghaziabad 201002 Uttar Pradesh India
| | - Anamika Yadav
- Medicinal and Process Chemistry Division CSIR-Central Drug Research Institute Lucknow 226031 Uttar Pradesh India
- Chemical Sciences Division Academy of Scientific and Innovative Research (AcSIR) Ghaziabad 201002 Uttar Pradesh India
| | - Ajay Kumar Srivastava
- Medicinal and Process Chemistry Division CSIR-Central Drug Research Institute Lucknow 226031 Uttar Pradesh India
- Chemical Sciences Division Academy of Scientific and Innovative Research (AcSIR) Ghaziabad 201002 Uttar Pradesh India
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12
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Sun M, Yu YL, Zhao L, Ding MW. One-pot and divergent synthesis of furo[3,2-c]quinolines and quinazolin-4(3H)-ones via sequential isocyanide-based three-component/Staudinger/aza-Wittig reaction. Tetrahedron 2021. [DOI: 10.1016/j.tet.2020.131868] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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13
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Ghoshal A, Yadav A, Srivastava AK. [3 + 2]-Dipolar Cycloaddition of Aldehyde-Tethered Alkynamides and Trimethylsilyl Amino Esters: A Gateway to Uniquely Functionalized Polycyclic N-Heterocycles via Post-Ugi Functionalization. J Org Chem 2020; 85:14890-14904. [PMID: 33136409 DOI: 10.1021/acs.joc.0c01539] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
An efficient method for the generation of uniquely functionalized pyrrolo-pyrrolizinones, pyrido-pyrrolizinones, and azepino-pyrrolizinones via [3 + 2]-dipolar cycloaddition is described. The method involves the synthesis of tethered alkynamides using Ugi condensation and oxidation that were subsequently subjected to a dipolar cycloaddition reaction with trimethylsilyl amino esters. Further transformations to demonstrate the utility of these scaffolds were also investigated.
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Affiliation(s)
- Anirban Ghoshal
- Division of Medicinal and Process Chemistry, CSIR-Central Drug Research Institute, Lucknow 226031, Uttar Pradesh, India.,Chemical Sciences Division, Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, Uttar Pradesh, India
| | - Anamika Yadav
- Division of Medicinal and Process Chemistry, CSIR-Central Drug Research Institute, Lucknow 226031, Uttar Pradesh, India.,Chemical Sciences Division, Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, Uttar Pradesh, India
| | - Ajay Kumar Srivastava
- Division of Medicinal and Process Chemistry, CSIR-Central Drug Research Institute, Lucknow 226031, Uttar Pradesh, India.,Chemical Sciences Division, Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, Uttar Pradesh, India
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14
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Singh SP, Tripathi S, Yadav A, Kant R, Srivastava HK, Srivastava AK. Synthesis of β- and γ-lactam fused dihydropyrazinones from Ugi adducts via a sequential ring construction strategy. Chem Commun (Camb) 2020; 56:12789-12792. [PMID: 32966412 DOI: 10.1039/d0cc04415f] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
A modular approach for the construction of β- and γ-lactam fused dihydropyrazinones from the readily available Ugi adducts has been described. The sequential construction of rings through base-mediated cycloisomerization followed by acid-mediated cyclization yielded β-lactam fused dihydropyrazinones. However, the Ugi-derived dihydropyrazinones afforded γ-lactam fused dihydropyrazinones under base-mediated cycloisomerization. The regioselectivity in the cycloisomerization reactions is explained on the basis of ring-strain. Substrate scope, limitations and mechanistic investigations through DFT-calculations have been explored.
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Affiliation(s)
- Sangh Priya Singh
- Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow-226031, India. and Chemical Sciences Division, Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
| | - Shashank Tripathi
- Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow-226031, India. and Chemical Sciences Division, Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
| | - Anamika Yadav
- Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow-226031, India. and Chemical Sciences Division, Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
| | - Ruchir Kant
- Molecular and Structural Biology Division, CSIR-Central Drug Research Institute, Lucknow-226031, India
| | - Hemant Kumar Srivastava
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research, Guwahati-781101, India.
| | - Ajay Kumar Srivastava
- Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow-226031, India. and Chemical Sciences Division, Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
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15
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Amador-Sánchez YA, Hernández-Vázquez E, González-Mojica N, Ramírez-Apan MT, Miranda LD. Diversity-oriented synthesis and cytotoxic screening of fused dihydropyrazin-2(1H)-ones through a Ugi 4-CR/deprotection/Heck sequence. Tetrahedron 2020. [DOI: 10.1016/j.tet.2020.131383] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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