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Wang X, Xiang J, Wang J, Yu Z, Tang ZL, Xiao J. H3PO3/I2 mediated formation of N-benzyl benzo heterocyclic ketones from aromatic aldehydes and benzyl alcohol derivatives. Tetrahedron 2022. [DOI: 10.1016/j.tet.2022.133094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Beardmore LND, Cobb SL, Brittain WDG. One-pot ester and thioester formation mediated by pentafluoropyridine (PFP). Org Biomol Chem 2022; 20:8059-8064. [PMID: 36047390 DOI: 10.1039/d2ob01268e] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Acyl fluorides are valuable synthetic intermediates, but in some cases they can be challenging to handle and difficult to isolate given their susceptibility to degradation. In addition, many reagents utilised to prepare acyl fluorides are incompatible with in situ generation strategies and require the acyl fluoride to be isolated before any further reaction can take place. The combination of these factors has meant that acyl fluorides are currently under investigated in nucleophilic substitution processes, and often only a limited substrate scope is tolerated where they have been used. Herein, we report that pentafluoropyridine can be utilised to generate acyl fluorides in situ under mild conditions, and that they can subsequently be used to generate a range of esters and thioesters. This methodology offers a simple one-pot synthesis of esters and thioesters directly from parent carboxylic acids.
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Affiliation(s)
- Liam N D Beardmore
- Department of Chemistry, Durham University, South Road, Durham, DH1 3LE, UK.
| | - Steven L Cobb
- Department of Chemistry, Durham University, South Road, Durham, DH1 3LE, UK.
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Ahmed R, Gupta R, Akhter Z, Kumar M, Singh PP. TCT-mediated click chemistry for the synthesis of nitrogen-containing functionalities: conversion of carboxylic acids to carbamides, carbamates, carbamothioates, amides and amines. Org Biomol Chem 2022; 20:4942-4948. [PMID: 35660834 DOI: 10.1039/d2ob00324d] [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
Here, we report a s-trichlorotriazine (TCT, also known as cyanuric chloride) mediated one-pot general method for the conversion of carboxylic acids into ubiquitous functionalities such as carbamides, carbamates, carbamothioates, amides, and amines. The TCT-mediated activation of acids followed by azidation and heating led to the isocyanate formation via Curtius rearrangement which involves click chemistry in the presence of nucleophiles and provided the coupled product. The TCT was employed at ≤40 mol% with respect to the starting materials; however, its bulk availability and low cost provide a unique opportunity towards its applicability in the synthesis of functional molecules. The optimized conditions have also been successfully demonstrated for gram scale synthesis and late-stage functionalization of natural products and drugs such as podophyllotoxin, eugenol, diosgenin, geraniol and fluvoxamine.
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Affiliation(s)
- Riyaz Ahmed
- Natural Product & Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu-180001, India. .,Academy of Scientific and Innovative Research, (AcSIR), Ghaziabad-201002, India
| | - Ria Gupta
- Natural Product & Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu-180001, India. .,Academy of Scientific and Innovative Research, (AcSIR), Ghaziabad-201002, India
| | - Zaheen Akhter
- Natural Product & Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu-180001, India. .,Academy of Scientific and Innovative Research, (AcSIR), Ghaziabad-201002, India
| | - Mukesh Kumar
- Natural Product & Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu-180001, India. .,Academy of Scientific and Innovative Research, (AcSIR), Ghaziabad-201002, India
| | - Parvinder Pal Singh
- Natural Product & Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu-180001, India. .,Academy of Scientific and Innovative Research, (AcSIR), Ghaziabad-201002, India
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Deng J, Xiao J, Wang X, Luo H, Jia Z, Wang J. Iodine promoted reduction of aromatic carbonyl compounds with phosphonic acid to access hydrocarbons. Tetrahedron 2022. [DOI: 10.1016/j.tet.2022.132755] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Guo F, Xiao J, Deng J, Li F, Tang Z. Esters as Both Alkylating and Acylating Reagents: PCl
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‐Promoted Friedel‐Crafts Reaction in One‐Pot. ChemistrySelect 2022. [DOI: 10.1002/slct.202103691] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Fengzhe Guo
- Key Laboratory of Theoretical Organic Chemistry and Functional Molecule of Ministry of Education School of Chemistry and Chemical Engineering Hunan University of Science and Technology Xiangtan 411201 China
| | - Jing Xiao
- Key Laboratory of Theoretical Organic Chemistry and Functional Molecule of Ministry of Education School of Chemistry and Chemical Engineering Hunan University of Science and Technology Xiangtan 411201 China
| | - Jinfeng Deng
- Key Laboratory of Theoretical Organic Chemistry and Functional Molecule of Ministry of Education School of Chemistry and Chemical Engineering Hunan University of Science and Technology Xiangtan 411201 China
| | - Fangshao Li
- Key Laboratory of Theoretical Organic Chemistry and Functional Molecule of Ministry of Education School of Chemistry and Chemical Engineering Hunan University of Science and Technology Xiangtan 411201 China
| | - Zi‐Long Tang
- Key Laboratory of Theoretical Organic Chemistry and Functional Molecule of Ministry of Education School of Chemistry and Chemical Engineering Hunan University of Science and Technology Xiangtan 411201 China
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Li F, Xiao J, Wu X, Wang X, Deng J, Tang Z. Metal-Free Formation of 2-Substitued Benzoxazoles with Amides and Esters. CHINESE J ORG CHEM 2022. [DOI: 10.6023/cjoc202111031] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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