Am. Fernandez et al., EASY ACCESS TO OPTICALLY PURE FUNCTIONALIZED GAMMA-ALKYLATED LACTONESSTARTING FROM (2R,3R)-TARTARIC ACID, Synlett, (5), 1995, pp. 431-432
Protected and deprotected gamma-alkylated dihydroxylactones 8 and 1 ar
e prepared from (2R,3R)-tartaric acid. The key step is the highly dias
tereoselective reduction of ketones 6 using sodium borohydride in meth
anol at low temperature.