Synthesis, Structure, and Unusual Reactivity of a Stable 3-(Oxazolidin-2-ylidene)thiophen-2-one
作者:R. Alan Aitken、Andrew D. Harper、Alexandra M. Z. Slawin
DOI:10.1021/acs.joc.6b01309
日期:2016.11.4
that exist mainly as the oxazolidinylidenethiophenones. The 3-oxazolidinylidenethiophen-2-one is a rare example of a stable heterocyclic o-quinone methide analogue that shows a varied pattern of reactivity, including both C- and O-alkylation, Michael addition via C-5 to an acetylenic ester, tetrachlorobenzannulation across positions 4 and 5, and formation of a hexacyclic fused-ring product with N-
用丁基锂和双(三甲基甲硅烷基)过氧化物处理2-和3-噻吩基恶唑啉可导致环羟基化,生成的产物主要为恶唑烷基亚叉基噻吩。3-恶唑烷亚叉基噻吩-2-酮是一种稳定的杂环邻醌甲基化物类似物的稀有实例,其表现出变化的反应模式,包括C-和O-烷基化,通过C-5的迈克尔加成至炔属酯,四氯苯甲酰化跨越位置4和5,并与N-苯基三唑啉二酮形成六环稠环产物。产物的晶体结构以分子间和分子内NH与CO的氢键为主。