GENERATION AND HYDROLYSIS OF <i>N</i>-ACYLOXAZOLINIUM SALTS ALLOWING REGIOSPECIFIC ACYLATION OF CHIRAL AMINO ALCOHOLS

Abstract

In an attempt to form 2-alkylidene-1,3-oxazolidines, chiral 2-oxazolines have been N-alkylated and N-acylated. Two new N-methyloxazolinium salts have been prepared and characterized, but alkaline treatment resulted in their decomposition. In contrast, attempts to isolate three N-benzoyloxazolinium salts gave the products of their ring hydrolysis: unsymmetrically diacylated amino alcohols whose structure was confirmed by X-ray diffraction in one case. Overall the method allows stepwise regiospecific N,O-diacylation of 2-amino alcohols.