Verfahren zur Herstellung von Castanospermin

摘要

Castanospermine (I) is prepared by starting from 5-(t-BOC)amino-5-deoxy-1,2-O-isopropylidene- alpha -D-glucuronolactone. Two additional carbons are added to the starting material using ethyl acetate and a strong base and the resulting cyclic hemiketal is subjected to a series of reductions, with intervening removal of protecting groups, to give the castanospermine. A substituted hydroxypyrrolidinone and a substituted hydroxypyrrolidine serve as intermediates in the process. -