O‐Maltosylation of Heterocyclic Ketene Aminals

Abstract

The stereuselective synthesis of O-maltmides by reacting benzoyl-substituted heterocyclic ketene aminals 1 or 2 with ecetylated maltasyl bromide3 WBS investigated. Compounds 1 or 2 reacted with3 in the presence of mercuric cyanide to give 0-mal-tosides4 or 5 with E-codgumtion. While 1 reacted with 3 in the presence of calcium hydride to give 0-maltasides 6 witb Z-cim6gwation.