Indeed, deuteration of 2b at different
reaction times (30 min and 2 h) gave only 3e with the
same enantiomeric enrichment of the starting epoxide
cis-1b. Equally highly stereospecific was the reaction
with other electrophiles such as CH3I, acetone, and N,Ndimethylbenzamide;
the corresponding R-adducts 3f-h
were isolated in good yields and high dr and er values
(Scheme 1, Table 2).