Synthesis of Phenyl- and Benzyl-Substituted Pyrrolidines and of a Piperidine by IntramolecularC-Alkylation. Synthons for tricyclic skeletons
作者:Roland Achini
DOI:10.1002/hlca.19810640727
日期:1981.11.4
The construction of new or novelly functionalized annulated and bridged tricylic compounds by two consecutive C,C-bond formations (a and b in la, Scheme 1) is described. In a first step, chloroalkyl-substituted aminonitriles yielded pyrrolidines 8, 15a, 15b, 23, 25 and piperidine 18 by carbanionic ring closure (Schemes 5, 6, 7 and 8). Subsequent Friedel-Crafts cyclization transformed the β-aminonitriles
描述了通过两个连续的C,C键形成物(1a中的a和b ,方案1)构造新的或新颖的官能化的环状和桥接的三聚化合物。在第一步骤中,氯代取代的氨基腈,得到吡咯烷8,图15A,15B,23,25和哌啶18通过负碳离子环闭合(方案5,6,7和8)。后续的Friedel-Crafts环化反应转化的β氨基腈8,图15A,15B,和18直接或通过他们的羧酸衍生物的茚并[ 1,2 -c]吡咯,2,5 -产甲烷- 3 - benzazocine,苯并[ ˚F ]异吲哚啉和1,4 -乙醇- 2 - benzazapine骨架11,16A,16B和21,分别(方案5、6和7)。通过经典的扩环反应吡咯并[ 3,4 - c ^ ]异喹啉和苯并吡喃并- [ 3,4 -c]吡咯骨架28 RESP。从11(方案9)获得31。