Unusual ring expansion observed during the Dakin–West reaction of tetrahydroisoquinoline-1-carboxylic acids using trifluoroacetic anhydride: an expedient synthesis of 3-benzazepine derivatives bearing a trifluoromethyl group
Unusual ring expansion observed during the Dakin–West reaction of tetrahydroisoquinoline-1-carboxylic acids using trifluoroacetic anhydride: an expedient synthesis of 3-benzazepine derivatives bearing a trifluoromethyl group
作者:Masami Kawase
DOI:10.1039/c39920001076
日期:——
The reaction of N-acyl-1,2,3,4-tetrahydroisoquinoline-1-carboxylic acids with trifluoroacetic anhydride proceeds through mesoionic 1,3-oxazol-5-one intermediates followed by ring expansion to form 2-trifluoromethyltetrahydro-3-benzazepinone derivatives in good yields.