Synthesis of 1-Deoxy-d-galactohomonojirimycin via Enantiomerically Pure Allenylstannanes

Abstract
1-Deoxy-d-galactohomonojirimycin was synthesized in seven steps from optically pure allenylstannane 4 and l-lactate-derived aldehyde 5 in 48% overall yield. The key step was the Lewis acid catalyzed reaction of 4 and 5 to give the syn-amino alcohol in excellent yield and very high diastereoselectivity.