Dihydrothiophenes as precursors to fused quinolines, quinolones and coumarins via o-quinodimethane intermediates
作者:Lindsay A. White、Richard C. Storr
DOI:10.1016/0040-4020(95)01099-8
日期:1996.2
5-dihydrothiophene is a convenient starting point for synthesis of a range of 3,4- and 2,3-quinoline and quinolone and coumarin fused dihydrothiophene dioxides. With the exception of the 2,3-quinoline derivatives these all lose sulfur dioxide on thermolysis to give the corresponding o-quinodimethanes which can be intercepted in Diels-Alder reactions.
3-甲氧羰基-4-酮-2,5-二氢噻吩是合成一系列3,4-和2,3-喹啉,喹诺酮和香豆素稠合的二氢噻吩二氧化物的便利起点。除2,3-喹啉衍生物外,所有这些均在热解时损失二氧化硫,得到相应的邻喹啉二甲烷,其可在狄尔斯-阿尔德反应中被拦截。