Convenient Preparation of Heteroazulenes by the Reaction of 2-Aminotropone with Hetreocumulenes in the Presence of a Base

摘要

Reactions of 2-aminotropone with heterocumulenes, N,N'-diphenylcarbodiimide, phenyl isothiocyanate, phenyl isocyanate, and carbon disulfide, in the presence of t-BuOK afforded 1-phenylcycloheptaimidazole-2(1H)-phenylimine, 1-phenylcyclohepataimidazole-2(1H)-thione, 1-phenylcyclohepta-imidazol-2(1H)-one along with 2H-cycloheptaoxazol-2-one, and 2H-cycloheptathiazol-2-one along with 2H-cycloheptaoxazole-2-thione in good to moderate yields, respectively.