Addition reactions of heterocyclic compounds. Part XLVII. Formation of benzazepines from indoles with dimethyl acetylenedicarboxylate in acetonitrile; crystal structure of dimethyl 2,3-dihydro-2-indol-3-ylbenz[b]azepine-3,4-dicarboxylate
作者:R. M. Acheson、J. N. Bridson、T. S. Cameron
DOI:10.1039/p19720000968
日期:——
1-Methylindole reacts with dimethylacetylenedicarboxylate in pure acetonitrile to give dimethyl 1-methylbenz[b]azepine-3,4-dicarboxylate. This undergoes a Diels–Alder addition across the 2- and 5-positions with one further mol. equiv. of the acetylene, and with 1-methylindole and acid gives dimethyl 2,3-dihydro-1-methyl-2-(1-methylindol-3-yl)benz[b]azepine-3,4-dicarboxylate. Treatment of indole with
1-甲基吲哚与乙酰二羧酸二甲酯在纯乙腈中反应,生成1-甲基苯并[ b ]氮杂3,4-二羧酸二甲酯。进一步在2位和5位上进行Diels-Alder加成反应。当量 乙炔,并与1-甲基吲哚和酸一起得到2,3-二氢-1-甲基-2-(1-甲基吲哚-3-基)苯并[ b ]氮杂3,4-二羧酸二甲酯。用乙腈中的炔属酯处理吲哚仅得到相应的2,3-二氢-2-(吲哚-3-基)苯并ze庚因(18),其结构已通过X射线衍射研究证实。(18)的晶体是三斜晶的,a = 10·46,b = 11·50,c = 8·85Å,α= 91·5,β= 114·6,γ= 106·2,空间群P。对该结构进行了精炼,使R 11·4%达到2989次独立反射。描述了这些a庚烷的一些还原产物,并讨论了它们的形成方式。