Top‐Down Chemoenzymatic Approach to a High‐Mannose‐Type Glycan Library: Synthesis of a Common Precursor and Its Enzymatic Trimming

: From the stacks: A novel method for construction of a high-mannose-type glycan library by systematic enzymatic trimming of a single synthetic Man9-based precursor was developed. Efficient chemical synthesis of the tetradecasaccharide common precursor and orthogonal enzymatic trimming to obtain all M(8-9) and G(1)M(8-9) derivatives was demonstrated. G = glucose, M = mannose.