A. Arany et al., 1,7-electrocyclisation of non-stabilised alpha,beta :gamma,delta-unsaturated azomethine ylides, J CHEM S P1, (18), 1999, pp. 2605-2608
The generation of alpha,beta:gamma,delta-unsaturated azomethine ylides 8 is
described, starting from N-substituted alpha-amino acids 7 and aldehydes 6
, 12. These azomethine ylides undergo a 1,7-electrocyclisation, followed by
a [1,5]-hydrogen shift, to give the dihydrobenzazepines 10a-f and 13.