Cyclization and cycloaddition of 1-cinnamylidene-5-phenyl-3-oxopyrazolidinium ylide
摘要:
Thermal cyclization of 1-cinnamylidene-5-phenyl-3-oxopyrazolidinium ylide (1b) led to a product 4 which is formally derived for further cycloaddition of 1b to the anticipated bicyclic [3.3.0]pyrazolidinone 3.