Addition of Organozinc Reagents to Glycopyranosyl Cyanides: Access to Keto Ester‐C‐glycosides or Unsaturated Acyl‐C‐glycosides

Addition of Reformatsky‐type or allylic zinc reagents to 2,3,4,6‐tetra‐ O ‐benzylglycopyranosyl cyanides led to keto ester‐ C ‐glycosides or unsaturated acyl‐ C ‐glycosides in moderate to excellent yields in the galactose, glucose, and mannose series.