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