The preparation of some 1,7b-disubstituted cyclopropa[c]isoquinolines via nitrile ylide cyclisations and their rearrangement to 2-benzazepines and 4-alkenyl-1,4-dihydroisoquinolines
作者:Jon-Paul Strachan、John T. Sharp、Simon Parsons
DOI:10.1039/a705531e
日期:——
Diene-conjugated nitrile ylides of the type 1a, having substituents other than hydrogen in the R1 position, cyclise normally to give the C-7b substituted cyclopropa[c]isoquinolines 2a. In cases where R2 or R3 = H the latter undergo the usual thermal rearrangement to give 5-substituted 2-benzazepines 5a. However, when R2 and R3 ≠ H and either is a CH3 group, then the presence of the C-7b substituent
在R 1位置具有除氢以外的取代基的类型为1a的二烯共轭腈,通常会环化生成C-7b取代的环丙烷[ c ]异喹啉2a。在R 2或R 3 = H的情况下,后者进行通常的热重排,得到5-取代的2-苯并ze庚因5a。然而,当R 2和R 3 ≠H且均为CH 3基团时,则2a中C-7b取代基的存在会将热重排转移到新的反应路径上,从而导致形成1,4-二氢-4 -烯基异喹啉14高产。