New methodology for the synthesis of unsaturated 8-, 9- and 10-membered lactams
Abstract
Unsaturated 8-, 9- and 10-membered medium ring lactams 1 (n= 1,2,3) have been prepared in good yield by the Claisen rearrangement of the vinyl-substituted precursors 3 in the presence of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU).