Abstract
α-Amidoalkylation of allyltrimethylsilane with (−)- and (+)-menthyl-2-(o–Chlorobenzoylamino)-2-halogenoethanoate (2, 4a and 4b) gave in the presence of zinc chloride, separable mixtures of the diastereomers (−)- and (+)-menthyl-2-(o–Chlorobenzoylamino)-4-pentenoate (5a, 5b and 6a, 6b). The absolute configurations of 5a, 5b and 6a, 6b were determined through conversion of 5a into S-(+)-norvaline hydrochloride.
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