H. Tomori et al., PRACTICAL SYNTHESIS OF (S)-3-(P-NITROBENZYLOXYCARBONYLAMINO)PYRROLIDINE AND ITS RELATED-COMPOUNDS FROM L-APARTIC ACID, Heterocycles, 44, 1997, pp. 213-225
An efficient method for the preparation of (S)-3-aminopyrrolidine deri
vatives was developed starting from L-aspartic acid, which involves an
efficient formation of a pyrrolidine-ring from allylamine and a pract
ical Pd/C-catalyzed cleavage of N-allyl protective group. This method
affords the enantiomerically pure desired compounds (1) in high overal
l yields.