Abstract

The absolute configuration of belactin A, a beta-lactone-containing serine carboxypeptidase inhibitor was studied by a crystal X-ray diffraction analysis and its absolute structure was determined to be (2R,3S)-2-¿(3S)-3-[(2-amino-5-chlorophenyl)carboxamido]-1,1-dimethyl-2-o xobutyl¿-3-methyl-4-oxooxetane. The importance of the beta-lactone structure for inhibitory activity was found by preparing several derivatives of belactin A.

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