Tandem carbophilic addition-N-acyliminium ion cyclization for the synthesis of functionalized pyrrolo[2,1-a]isoquinolones: Key intermediates for the preparation of Erythrina-type alkaloids
作者:Izaskun Manteca、Nuria Sotomayor、María-Jesús Villa、Esther Lete
DOI:10.1016/0040-4039(96)01745-5
日期:1996.10
3-(2-trimethylsilyl-1,3-dithian-2-yl)propyllithium 11, followed by desilylation and subsequent retro-Diels-Alder reaction affords the α,β-unsaturated pyrroloisoquinolone 9b, immediate precursor of Erythrina-type alkaloids.
顺序地对有机锂试剂进行嗜碳加成反应-N-苯乙基乙基琥珀酰亚胺3的N-酰基酰亚胺离子环化反应可高产率产生吡咯并[2,1-a]异喹诺酮1,并可能通过改变有机锂来改变C-10b处的取代基。于这种方法的应用顺-norbor -5-烯-2,3-二羧酰亚胺7使用官能化有机锂试剂中,3-(2-三甲基甲硅烷基-1,3-二噻烷-2-基)丙基11,随后脱甲硅烷基然后进行逆Diels-Alder逆反应,得到α,β-不饱和吡咯并异喹诺酮9b,Erythrina型生物碱的直接前体。