4-Dimethylamino-3-butyne-2-one

P-Ketobenzoxazoles. A soln. of 4-dimethylamino-3-butyn-2-one and o-aminophenol in tetrahydrofuran refluxed under argon for 3 h at 65-70° - l-(2-benzoxazolyl)-2-propanone. Y 58%. F.e., incl. 2-p-keto-A -oxazolines, -benzothiazoles, and -A -imidazolines, also 2-amino-3//-1,5-benzodiazepines from o-diamines, s. I.G. Ostrou-mov et al., Zh. Org. Khim. 24, 1165-72 (1988). 

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