Synthesis of Functionalized Cycloprop[<i>f</i>]indenes<i>via</i>the Carbene Addition Route
作者:Paul Müller、Zhongshan Miao
DOI:10.1002/hlca.19940770729
日期:1994.11.2
The synthesis of 4,5-dihydro-1H,3H-cycloprop[f]inden-4-ol (1) and diethyl 4,5-dihydro-1H,3H-cycloprop[f]-indene-4,4-dicarboxylate (26) starting from diene 4 is described. The cyclopentene ring is constructed by condensation of diethyl malonate to the dibromide 21. The key-step in the synthesis of 1 consists in a twofold Curtius degradation of 22, with subsequent reduction of the carbonyl group and
4,5-二氢-1 H,3 H-环丙[ f ]茚满-4-醇(1)和二乙基4,5-二氢-1 H,3 H-环丙[ f ]-茚满-4,描述了从二烯4开始的4-二羧酸酯(26)。环戊烯环通过丙二酸二乙酯与二溴化物21的缩合而构成。的关键步骤中的合成1由以双重库尔提斯降解22,随后还原羰基和芳构化的。异构体的骨架31合成通过丁二烯环化加成到环戊-4-烯-1,3-二酮(7)上,缩酮化后将二氯卡宾加成到加合物27中。通过碱诱导的几种适当取代的前体的消除尝试合成二氢环丙基[ f ]茚(2)的尝试失败了。