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Ali K, Panda G. Transition-Metal-Free Multicomponent Approach to the Regioselective Synthesis of Highly Substituted N-Alkylpyrazoles. Chem Asian J 2023; 18:e202201129. [PMID: 36585904 DOI: 10.1002/asia.202201129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Revised: 12/22/2022] [Accepted: 12/28/2022] [Indexed: 01/01/2023]
Abstract
An efficient transition-metal-free multicomponent approach to the regioselective synthesis of highly substituted N-alkylpyrazoles through 1,6-addition of pyrazole (in situ generated from α,β-unsaturated aldehyde and hydrazide) to para-Quinone Methides has been developed. The N-alkylpyrazole containing triarylmethanes having several heteroaryl rings (quinoline, pyridine, thiophene) at the central methine carbon atom was developed. This chemical process may be used for large-scale synthesis and provides a novel way to produce triarylmethanes with diverse functional groups.
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Affiliation(s)
- Kasim Ali
- Medicinal & Process Chemistry Division, CSIR-Central Drug Research Institute, Sector 10, Jankipuram Extension, Lucknow, 226031, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh, 201002, India
| | - Gautam Panda
- Medicinal & Process Chemistry Division, CSIR-Central Drug Research Institute, Sector 10, Jankipuram Extension, Lucknow, 226031, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh, 201002, India
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Sodium dodecyl benzene sulfonate-catalyzed reaction for green synthesis of biologically active benzylpyrazolyl-coumarin derivatives, mechanism studies, theoretical calculations. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.132908] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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Ali K, Mishra P, Kumar A, Reddy DN, Chowdhury S, Panda G. Reactivity vs. selectivity of quinone methides: synthesis of pharmaceutically important molecules, toxicity and biological applications. Chem Commun (Camb) 2022; 58:6160-6175. [PMID: 35522910 DOI: 10.1039/d2cc00838f] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Quinone methides (QMs) are considered to be highly reactive intermediates because of their aromatization both in chemical and biological systems. Being highly accessible, quinone methides (QMs) have been widely exploited and their concurrent use has been manifested for the synthesis of tertiary and quaternary carbon centers of bioactives, drugs and drug-like molecules. In this feature article, the synthetic routes, structure-reactivity relationships and synthetic applications of quinone methides are discussed. Formation of the intermediates during bioactivation of different chemical entities and possible chemical manifestations leading to their toxicity in biological systems are also covered.
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Affiliation(s)
- Kasim Ali
- Medicinal & Process Chemistry Division, CSIR-Central Drug Research Institute, Jankipuram Extension, Sector 10, Lucknow 226031, UP, India. .,Academy of Scientific & Industrial Research (AcSIR), Ghaziabad, Uttar Pradesh-201 002, India
| | - Prajjval Mishra
- Medicinal & Process Chemistry Division, CSIR-Central Drug Research Institute, Jankipuram Extension, Sector 10, Lucknow 226031, UP, India.
| | - Awnish Kumar
- Medicinal & Process Chemistry Division, CSIR-Central Drug Research Institute, Jankipuram Extension, Sector 10, Lucknow 226031, UP, India.
| | - Damodara N Reddy
- Medicinal & Process Chemistry Division, CSIR-Central Drug Research Institute, Jankipuram Extension, Sector 10, Lucknow 226031, UP, India. .,Academy of Scientific & Industrial Research (AcSIR), Ghaziabad, Uttar Pradesh-201 002, India
| | - Sushobhan Chowdhury
- Medicinal & Process Chemistry Division, CSIR-Central Drug Research Institute, Jankipuram Extension, Sector 10, Lucknow 226031, UP, India.
| | - Gautam Panda
- Medicinal & Process Chemistry Division, CSIR-Central Drug Research Institute, Jankipuram Extension, Sector 10, Lucknow 226031, UP, India. .,Academy of Scientific & Industrial Research (AcSIR), Ghaziabad, Uttar Pradesh-201 002, India
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Nipate DS, Sonam, Shinde VN, Rangan K, Kumar A. TEMPO-Mediated Synthesis of Indolyl/Imidazo[1,2- a]pyridinyl-Substituted para-Quinone Methides from Butylated Hydroxytoluene. J Org Chem 2021; 86:17090-17100. [PMID: 34762443 DOI: 10.1021/acs.joc.1c02202] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A series of indolyl or imidazo[1,2-a]pyridinyl-substituted para-quinone methides (p-QMs) is prepared by a metal-free, TEMPO-mediated cross-dehydrogenative coupling of butylated hydroxytoluene (BHT) with indoles or imidazo[1,2-a]pyridines in good to high yields. Broad substrate scope with respect to indoles and imidazo[1,2-a]pyridines, good functional group tolerance, and acid/base-free conditions are advantageous feature of the developed protocol. The method was amenable for scale-up on the gram scale. Based on control experiments, a reaction mechanism is proposed to describe this transformation.
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Affiliation(s)
- Dhananjay S Nipate
- Department of Chemistry, Birla Institute of Technology & Science Pilani, Pilani Campus, Rajasthan 333031, India
| | - Sonam
- Department of Chemistry, Birla Institute of Technology & Science Pilani, Pilani Campus, Rajasthan 333031, India
| | - Vikki N Shinde
- Department of Chemistry, Birla Institute of Technology & Science Pilani, Pilani Campus, Rajasthan 333031, India
| | - Krishnan Rangan
- Department of Chemistry, Birla Institute of Technology & Science Pilani, Hyderabad Campus, Telangana 500078, India
| | - Anil Kumar
- Department of Chemistry, Birla Institute of Technology & Science Pilani, Pilani Campus, Rajasthan 333031, India
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