Novel methods for the synthesis of 5-substituted-3-carboxy-2,5- and 4,5-dihydrothiophenes and 5-substituted 2- and 3-sulfolenes
作者:James A. Wilkinson、Nicolas Ardes-Guisot、Sylvie Ducki、John Leonard
DOI:10.1016/j.tet.2006.11.061
日期:2007.1
Various approaches to the syntheses of 5-substituted-3-carbomethoxy-2,5-dihydrothiophenes and their product sulfolenes, required as synthetic precursors for tangutorine, are described. An efficient route to 3,5-disubstituted-4,5-dihydrothiophenes and hence 3,5-disubstituted-2-sulfolenes by radical chemistry is also described.
描述了合成作为桔梗碱的合成前体所需的5-取代的-3-羰基甲氧基-2,5-二氢噻吩及其产物亚砜的各种方法。还描述了通过自由基化学反应制备3,5-二取代的4,5-二氢噻吩并因此得到3,5-二取代的-2-亚砜基的有效途径。