Synthesis of Functionalized Indole- and Benzo-Fused Heterocyclic Derivatives through Anionic Benzyne Cyclization
作者:José Barluenga、Francisco J. Fañanás、Roberto Sanz、Yolanda Fernández
DOI:10.1002/1521-3765(20020503)8:9<2034::aid-chem2034>3.0.co;2-i
日期:2002.5.3
six-membered benzo-fused N-, O-, and S-heterocycles is reported. The key step involves the generation of a benzyne-tethered vinyl or aryllithium compound that undergoes a subsequent intramolecular anionic cyclization. Reaction of the organolithium intermediates with selected electrophiles allows the preparation of a wide variety of indole, tetrahydrocarbazole, dihydrofenantridine, dibenzopyran, and dibenzothiopyran
报道了一种新的方法的发展,该方法用于区域选择性合成功能化的吲哚和六元苯并稠合的N,O和S杂环。关键步骤涉及生成苯并炔系链的乙烯基或芳基锂化合物,该化合物随后进行分子内阴离子环化。有机锂中间体与选择的亲电试剂的反应使得可以制备多种吲哚,四氢咔唑,二氢苯并吡啶,二苯并吡喃和二苯并噻喃并吡喃衍生物。最后,将该策略应用于合适的起始原料可以制备一些色胺和5-羟色胺类似物。