An improved synthesis of substituted benzo[b]thiophen-2-carboxylic acids and related acids
作者:P.M. Chakrabarti、N.B. Chapman、K. Clarke
DOI:10.1016/0040-4020(69)80021-9
日期:1969.1
The oxidative cyclization of β-Aryl-α-mercaptoacrylic acids with chlorine in dry carbon tetrachloride rapidly gives the corresponding benzo[b]thiophen-2-carboxylic acids in high yield. This process is a considerable improvement on processes previously reported. The purity of the crude β-aryl-α-mercaptoacrylic acids can be determined by titration with iodine in ethanol and thus the crude intermediates
在干燥的四氯化碳中,β-芳基-α-巯基丙烯酸与氯的氧化环化反应可快速生成相应的苯并[ b ]噻吩-2-羧酸。此过程是对先前报告的过程的重大改进。粗β-芳基-α-巯基丙烯酸的纯度可以通过在乙醇中用碘滴定来确定,因此无需使用所计算出的氯气量即可纯化粗中间体,而无需进一步纯化即可将其中间体环化。