Polysubstituted monocyclic boroxazolidines

Abstract

Six new substituted aminoethyl esters of hydroxydiphenylborane are described. In contrast to the behaviour of triptych boroxazolidines, in which subsituents in the amino-alcohol carbon atoms are associated with increased resistance of the boroxatolidine towards acidic hydrolysis, increased substitution among the monocyclic boroxazolidines is aosociated with increased lability in acidic solutions.