Evidence for the non-concerted [4+2]-cycloaddition of N-aryl imines when acting as both dienophiles and dienes under Lewis acid-catalysed conditions
作者:Stephen Hermitage、David A. Jay、Andrew Whiting
DOI:10.1016/s0040-4039(02)02392-4
日期:2002.12
The ytterbium(III) triflate-catalysed reaction of a para-methoxyaniline, ethyl glyoxalate-derived imine, with a series of different dienes has resulted in products which initially suggest the operation of two possible modes of aza-Diels–Alder reaction, however, a more likely explanation is that a common reaction mechanism is operating, involving a stepwise Lewis acid-catalysed process and a common