J. Kuban et al., Synthesis of trihydroxylated pyrrolizidine using 1,3-dipolar cycloadditionof D-erythrose derived nitrone, SYNLETT, (12), 2001, pp. 1866-1868
A route has been developed for the synthesis of enantiomerically and diaste
reomerically pure trihydroxylated pyrrolizidines. A chiral sugar derived ni
trone undergoes diastereoselective dipolar cycloaddition with methyl acryla
te to afford erythro-cis isoxazolidine a suitable cycloadduct undergoes N-O
cleavage and recyclization to (1S.2R.6R.7aS)-trihydroxylated pyrrolizidine
.