(2R,3S,4S,5R,6S)-5,6-Diacetoxy-4-benzyloxy-3-(4-oxo-pentanoyloxy)-tetrahydro-pyran-2-carboxylic acid 、
碘甲烷 在
potassium hydrogencarbonate 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
生成 (2R,3S,4S,5R,6S)-5,6-Diacetoxy-4-benzyloxy-3-(4-oxo-pentanoyloxy)-tetrahydro-pyran-2-carboxylic acid methyl ester