Metalation <i>vs </i>Nucleophilic Addition in the Reactions of <i>N</i>-Phenethylimides with Organolithium Reagents. Ready Access to Isoquinoline Derivatives <i>via</i> <i>N</i>-Acyliminium Ions and Parham-Type Cyclizations
作者:M. Isabel Collado、Izaskun Manteca、Nuria Sotomayor、María-Jesús Villa、Esther Lete
DOI:10.1021/jo962155o
日期:1997.4.1
Sequential carbophilic addition of organolithium reagents and N-acyliminium ion cyclization of N-phenethylimides 1 affords the substituted isoquinolones 3 in high yields, with the possibility of varying the substituent at the C-1 position of the isoquinoline ring by changing the organolithium reagent. Ready access to the isoquinoline nucleus via Parham-type cyclization of imides 2 is also described
顺序地对有机锂试剂进行嗜碳加成和N-苯乙基酰亚胺1的N-酰亚胺离子环化,可高产率地提供取代的异喹诺酮3,并且可以通过改变有机锂试剂来改变异喹啉环的C-1位的取代基。还描述了通过Parham型酰亚胺2的环化作用易于进入异喹啉核。我们已经证明,碘化的酰亚胺2可以在酰亚胺基团存在的情况下耐受金属-卤素的交换,并且如此获得的芳族有机金属衍生物的分子内环化反应会生成相应的酰胺4。两种方法都可以有效制备各种类型的酰胺。仅通过改变易于获得的起始酰亚胺上的取代方式,就可制得异喹啉类生物碱。从而,