Facile synthesis of 4,6-dihydrothieno[3,4-b]thiophene 5,5-dioxide. A synthetic equivalent of 2,3-dihydro-2,3-dimethylenethiophene
作者:Ta-Shue Chou、Chung-Ying Tsai
DOI:10.1039/c39910001287
日期:——
4,6-Dihydrothieno[3,4-b]thiophene 5,5-dioxide 4, a stable precursor of 2,3-dihydro-2,3-dimethylenethiophene 3, conveniently prepared from 4-bromo-3-chloro-2,3-dihydrothiophene S,S-dioxide, can easily be alkylated and loses SO2 upon heating so that 4 serves as a useful synthetic equivalent of 3.
4,6-二氢噻吩并[3,4- b ]噻吩-5,5-二氧化物4,2,3-二氢-2,3- dimethylenethiophene的稳定前体3,方便地从4-溴-3-氯-2-制备3-二氢噻吩S(S-二氧化物)很容易被烷基化,加热时失去SO 2,因此4可用作3的有用合成当量。