Abstract
The enantioselectivity in the base-promoted cyclization of N-chloroacetyl derivatives of Phe, Phg, and Hph is dependent on the side-chain length, with the best results for Phg analogues (up to 74% ee). In contrast, shortening of the N-substituent, from a ( p-methoxy)benzyl group to a ( p-methoxy)phenyl moiety, led to a decrease in selectivity.
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