The reaction of benzyne with imines
Abstract
The isolation of acridines from reaction of benzyne with the imines, N-benzylideneaniline and N-benzylidene-4-chlproaniline, and the amidines, N,N-dimethyl-N′-phenylformamidine and N-phenyliminomethylpyrrolidine, provides unambiguous evidence for the formation of transient benzazetidines by 2 + 2 cycloaddition.