ethyl 5-acetamido-3,5-dideoxy-4-O-methyl-D-glycero-β-D-galacto-2-nonulopyranosidonic acid 、
丁酮 以
乙醚 、
异丙醇 为溶剂,
以30%的产率得到(2S,4S,5R,6S)-5-Acetylamino-2-ethoxy-6-[(R)-((R)-2-ethyl-2-methyl-[1,3]dioxolan-4-yl)-hydroxy-methyl]-4-methoxy-tetrahydro-pyran-2-carboxylic acid