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Putta VPRK, Vodnala N, Gujjarappa R, Tyagi U, Garg A, Gupta S, Pujar PP, Malakar CC. Reagent-Controlled Divergent Synthesis of 2-Amino-1,3-Benzoxazines and 2-Amino-1,3-Benzothiazines. J Org Chem 2019; 85:380-396. [DOI: 10.1021/acs.joc.9b02384] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- V. P. Rama Kishore Putta
- Department of Medicinal Chemistry, Jubilant Biosys, Bangalore 560022, Karnataka, India
- Department of Chemistry, CHRIST (Deemed to be University), Bangalore 560029, India
| | - Nagaraju Vodnala
- Department of Chemistry, National Institute of Technology Manipur, Langol, Imphal 795004, Manipur, India
| | - Raghuram Gujjarappa
- Department of Chemistry, National Institute of Technology Manipur, Langol, Imphal 795004, Manipur, India
| | - Ujjawal Tyagi
- Department of Chemistry, National Institute of Technology Manipur, Langol, Imphal 795004, Manipur, India
| | - Aakriti Garg
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Kolkata, Chunilal Bhawan, 168, Maniktala Main Road, Kolkata 700054, India
| | - Sreya Gupta
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Kolkata, Chunilal Bhawan, 168, Maniktala Main Road, Kolkata 700054, India
| | - Prasad Pralhad Pujar
- Department of Chemistry, CHRIST (Deemed to be University), Bangalore 560029, India
| | - Chandi C. Malakar
- Department of Chemistry, National Institute of Technology Manipur, Langol, Imphal 795004, Manipur, India
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Yan H, Xiao XQ, Hider RC, Ma Y. A Simple Metal-Free Cyclization for the Synthesis of 4-Methylene-3-Substituted Quinazolinone and Quinazolinthione Derivatives: Experiment and Theory. Front Chem 2019; 7:584. [PMID: 31475141 PMCID: PMC6706782 DOI: 10.3389/fchem.2019.00584] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2019] [Accepted: 08/02/2019] [Indexed: 11/28/2022] Open
Abstract
A new series of 3-substituted 4-methylene-quinazolinthiones and 4-methylene-quinazolinones were synthesized in moderate to excellent yield through a simple reaction of 2-aminoacetophenones with isocyanates or isothiocyanates. The reaction shows good tolerance of many important functional groups in the presence of air and water under metal-free conditions. Only water is produced as a coproduct, rendering this “green” methodology a highly versatile and eco-friendly alternative to the existing methods for the construction of the quinazolinone/quinazolinthione framework. We have interpreted the reaction mechanism by use of quantum chemical calculations on the basis of state-of-the-art computational methods SMD-B3LYP-D3(BJ)/BS1//B3LYP/BS1.
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Affiliation(s)
- Huihui Yan
- School of Pharmaceutical and Chemical Engineering, Taizhou University, Taizhou, China.,School of Pharmaceutical Science, Zhejiang Chinese Medical University, Hangzhou, China
| | - Xu-Qiong Xiao
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, Hangzhou, China
| | - Robert C Hider
- Institute of Pharmaceutical Science, King's College London, London, United Kingdom
| | - Yongmin Ma
- School of Pharmaceutical and Chemical Engineering, Taizhou University, Taizhou, China.,School of Pharmaceutical Science, Zhejiang Chinese Medical University, Hangzhou, China
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3
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Wadhwa P, Kharbanda A, Sharma A. Thia-Michael Addition: An Emerging Strategy in Organic Synthesis. ASIAN J ORG CHEM 2018. [DOI: 10.1002/ajoc.201700609] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Preeti Wadhwa
- Department of Chemistry; Indian Institute of Technology; Roorkee India
| | | | - Anuj Sharma
- Department of Chemistry; Indian Institute of Technology; Roorkee India
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4
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Dong JL, Wei PS, Yu LSH, Xie JW. Chemoselective Synthesis of Structurally Diverse 3,4-Dihydroquinazoline-2(1H)-thiones and 4H-Benzo[d][1,3]thiazines. J Org Chem 2018; 83:2219-2226. [PMID: 29363980 DOI: 10.1021/acs.joc.7b03120] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An efficient, mild, and substrate/catalyst-controlled chemoselective reaction of o-isothiocyanato-(E)-cinnamaldehyde with amines has been established, producing three types of six-membered heterocycles: 2-(4H-benzo[d][1,3]thiazin-4-yl)acetaldehydes, 2-(2-thioxo-1,2,3,4-tetrahydroquinazolin-4-yl)acetaldehydes, and (E)-4-(2-methoxyvinyl)-4H-benzo[d][1,3]thiazines. The reaction scopes were quite broad and excellent yield was achieved. This method is extremely efficient and practical and can be conducted on a gram-scale with slightly inferior reactivity under catalyst-free conditions at low cost, making it an ideal alternative to existing methods.
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Affiliation(s)
- Jian-Lian Dong
- Department of Chemistry and Life Science, Zhejiang Normal University , Jinhua 321004, P. R. China
| | - Pei-Shun Wei
- Department of Chemistry and Life Science, Zhejiang Normal University , Jinhua 321004, P. R. China
| | - Li-Si-Han Yu
- Department of Chemistry and Life Science, Zhejiang Normal University , Jinhua 321004, P. R. China
| | - Jian-Wu Xie
- Department of Chemistry and Life Science, Zhejiang Normal University , Jinhua 321004, P. R. China
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5
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Xie T, Xiao Y, Zhao S, Hu XQ, Xu PF. Catalyst-Free Chemoselective Synthesis of 3,4-Dihydroquinazoline-2-thiones and 2-Imino[1,3]benzothiazines. J Org Chem 2016; 81:10499-10505. [DOI: 10.1021/acs.joc.6b01232] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Ting Xie
- State
Key Laboratory of Applied Organic Chemistry, College of Chemistry
and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China
| | - Yu Xiao
- State
Key Laboratory of Applied Organic Chemistry, College of Chemistry
and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China
| | - Shuai Zhao
- School of Pharmaceutical Engineering & Life Science, Changzhou University, Changzhou 213164, P. R. China
| | - Xiu-Qin Hu
- State
Key Laboratory of Applied Organic Chemistry, College of Chemistry
and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China
| | - Peng-Fei Xu
- State
Key Laboratory of Applied Organic Chemistry, College of Chemistry
and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China
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6
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Wadhwa P, Kaur T, Sharma A. Solvent-Free Pot-, Atom- and Step-Economic Synthesis of Novel Benzo[d]thiazole-[1,3]-thiazine Hybrids in a One-Pot Reaction. ASIAN J ORG CHEM 2016. [DOI: 10.1002/ajoc.201600098] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Preeti Wadhwa
- D-305, Medicinal Chemistry Lab; Department of Chemistry; Indian Institute of Technology Roorkee; Roorkee 247667 India
| | - Tanpreet Kaur
- D-305, Medicinal Chemistry Lab; Department of Chemistry; Indian Institute of Technology Roorkee; Roorkee 247667 India
| | - Anuj Sharma
- D-305, Medicinal Chemistry Lab; Department of Chemistry; Indian Institute of Technology Roorkee; Roorkee 247667 India
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Mahato K, Bagdi PR, Khan AT. Yb(OTf)3 catalysed regioselective synthesis of unusual di- and tri- substituted 3,4-dihydrothiochromeno[3,2-e][1,3]thiazin-5(2H)-one derivatives through a pseudo four-component hetero-Diels–Alder reaction. RSC Adv 2015. [DOI: 10.1039/c5ra06905j] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
An efficient and facile regioselective synthesis of di- and tri-substituted 3,4-dihydrothiochromeno[3,2-e][1,3]thiazin-5(2H)-one derivatives was achieved through an ytterbium triflate catalysed pseudo four component hetero-Diels–Alder reaction.
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Affiliation(s)
- Karuna Mahato
- Department of Chemistry
- Indian Institute of Technology Guwahati
- Guwahati 781 039
- India
| | - Prasanta Ray Bagdi
- Department of Chemistry
- Indian Institute of Technology Guwahati
- Guwahati 781 039
- India
| | - Abu T. Khan
- Department of Chemistry
- Indian Institute of Technology Guwahati
- Guwahati 781 039
- India
- Vice-Chancellor
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8
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Pandey G, Bhowmik S, Batra S. Synthesis of 4-substituted imino-4H-benzo[d][1,3] thiazin-2-amines via palladium-catalysed isocyanide insertion in 2-bromophenylthioureas. RSC Adv 2014. [DOI: 10.1039/c4ra06875k] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
The palladium-catalysed isocyanide insertion in 2-bromophenylthioureas leads to the formation of 4-substituted imino-4H-benzo[d][1,3]thiazin-2-amines via C–S cross coupling reaction of the intermediate imidoylpalladium species.
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Affiliation(s)
- Garima Pandey
- Medicinal & Process Chemistry Division
- CSIR-Central Drug Research Institute
- Lucknow-226031, India
| | - Subhendu Bhowmik
- Medicinal & Process Chemistry Division
- CSIR-Central Drug Research Institute
- Lucknow-226031, India
| | - Sanjay Batra
- Medicinal & Process Chemistry Division
- CSIR-Central Drug Research Institute
- Lucknow-226031, India
- Academy of Scientific and Innovative Research
- New Delhi, India
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