Use of (Z)-β-(2-Fluorobenzenesulfonyl)vinylamines as Novel Synthons in the Synthesis of 1,4-Benzothiazine Derivatives
摘要:
A novel synthetic route for arylated 1,4-benzothiazine derivatives has been developed. This method utilizes a key intramolecular nucleophilic aromatic substitution step of the corresponding (Z)-beta-(2-fluorobenzenesulfonyl) vinylamine intermediate to construct the benzothiazine ring. A wide range of aryl and heteroaryl substituent groups can be installed from commercial boronic acids. Both mono-and diarylated products have been synthesized in good yields and with good functional group tolerance.
One-Pot Domino Reaction: Direct Access to Polysubstituted 1,4-Benzothiazine 1,1-Dioxide via Water–Gas Shift Reaction Utilizing DMF/H<sub>2</sub>O
作者:Yogesh Sharma、Ganesh P. Pawar、Vinod D. Chaudhari
DOI:10.1021/acs.joc.2c02171
日期:2023.1.6
Benzothiazine 1,1-dioxide (BTDO) is a privileged chemical motif, and its metal-free domino access is in high demand. Current BTDO production methods require costly metal catalysts or harsh reaction conditions. A facile domino approach to BTDO via a water–gas shift reaction (WGSR) employing sodium 2-nitrobenzenesulfinates and α-bromo ketones is presented. This strategy is cost-effective and environmentally