A stereoselective synthesis of dialkylaminomethyl substituted halobutadienes via amine induced ring-opening of thiophene-1,1-dioxides
作者:S. Gronowitz、A. Hallberg、G. Nikitidis
DOI:10.1016/s0040-4020(01)87664-x
日期:1987.1
1-dioxide in good yields. The reaction of 3-chloro- and 3-bromo-2,5-dimethylthiophene-1, 1-dioxide with piperidine, pyrrolidine and morpholine at 100 °C intoluene on the other hand gave only one of the four possible isomeric dialkylaminomethyl-substituted hatobutadienes as main products and dialkylamino-substituted cis-2,3-dihydrothiophene-1,1-dioxides as by-products. Possible reaction paths are discussed.
2,5-二甲基噻吩-1,1-二氧化物和3-氯-2,5-二甲基1-噻吩-1,1-二氧化物与哌啶水溶液在室温下以迈克尔加成反应进行反应,分别得到2,5-二甲基- 3-哌啶子基-反式-2,3-二氢噻吩-1,1-二氧化物和3-氯-2,5-二甲基-4-哌啶子基-反式-4,5-二氢噻吩-1,1-二氧化物,收率良好。另一方面,3-氯-和3-溴-2,5-二甲基噻吩-1,1-二氧化物与哌啶,吡咯烷和吗啉在100°C的甲苯中反应,仅给出了四种可能的异构体,被二烷基氨基甲基取代的but丁二烯中的一个主要产品为二烷基氨基取代的顺式-2,3-二氢噻吩-1,1-二氧化物。讨论了可能的反应路径。