The unique nucleophilic reactivity of arylaminochlorocarbenes

4-Methyl and 4-methoxyphenylaminochlorocarbene (readily formed by deprotonation of the Vilsmeier reagent derived from the corresponding Nmethylformanilide with Hünigʹs base) reacted with diethyl acetylenedicarboxylate to give 1:2 quinoline adducts, while phalophenylaminochlorocarbenes yielded benzoazepine derivatives from 2:1 interaction of the carbene with oxalyl chloride under the same reaction conditions.