ASYMMETRIC-SYNTHESIS OF THE N-TERMINAL COMPONENT OF MICROGININ - (2S,3R)-3-AMINO-2-HYDROXYDECANOIC ACID, ITS (2R,3R)-EPIMER AND (3R)-3-AMINODECANOIC ACID

3-Amino-2-hydroxydecanoic acid (AHDA) is a novel amino acid which has been suggested as the N-terminal component of the recently isolated angiotensin-converting enzyme inhibitor microginin. The naturally occurring amino acid was found to possess syn relative stereochemistry and (2S,3R) absolute stereochemistry when the reported H-1 and C-13 nmr spectroscopic data and the CD data were compared to the spectroscopic data for synthetic (2R,3R)- and (2S,3R)-AHDA. These studies complete the stereochemical assignment of microginin.