摘要:
                                The 1,3-dipolar cycloaddition of munchnones (1,3-oxazolium 5-olates) to beta-chloro-beta-(trifluoromethyl)vinyl phenyl ketone (1) and butyl beta-chloro-gamma,gamma,gamma-trifluorocrotonate (2) gave (trifluoromethyl)pyrroles.  The monocyclic munchnones 3a-c yielded the beta-(trifluoromethyl)pyrroles 7a-c and 8a-c regiospecifically.  The bicyclic and tricyclic munchnones 9a,b and 16a,b reacted with 1 and 2 to give mixtures of regioisomeric fused-ring trifluoromethylated pyrroles.  In all instances, the unsaturated phenone 1 was more reactive than the crotonate 2.  The cycloaddition of munchnones to the former occurred with a higher degree of regioselectivity.