作者:Amita Mishra、Sanjay Batra
DOI:10.1002/ejoc.201000355
日期:2010.9
A straightforward strategy for the synthesis of imidazole-fused benzodiazocine from 1-(2-nitrophenyl)-1H-imidazole-2-carbaldehyde via Morita–Baylis–Hillman reaction followed by reductive intramolecular cyclization is described. Alternatively the Horner–Wadsworth–Emmons reaction of this substrate with triethyl phosphonoacetate yielded (E)-ethyl 3-(1-(2-nitrophenyl)-1H-imidazol-2-yl)acrylate which upon
描述了通过 Morita-Baylis-Hillman 反应从 1-(2-硝基苯基)-1H-咪唑-2-甲醛合成咪唑稠合苯并二氮嗪的直接策略,然后进行还原性分子内环化。或者,该底物与膦酰基乙酸三乙酯的 Horner-Wadsworth-Emmons 反应产生 (E)-3-(1-(2-硝基苯基)-1H-咪唑-2-基)丙烯酸乙酯,其在顺序还原、皂化和酰胺偶联后提供咪唑稠合的二氮唑酮。另一方面,1-(2-硝基苯基)-1H-吡咯-2-甲醛未能进行 Morita-Baylis-Hillman 反应,但成功生成 (E)-乙基 3-(1-(2-硝基苯基)-1H -pyrrol-2-yl) 丙烯酸酯通过 Horner-Wadsworth-Emmons 反应,通过与咪唑类似的一系列反应,以良好的收率产生吡咯稠合的重氮酮。