甲氧羰基亚甲基三苯基正膦 、
ethyl 2-oxo-(2,3:5,6-di-O-isopropylidene-α-D-mannofuranosyl)acetate 以
氯仿 为溶剂,
以73.5%的产率得到(Z)-2-[(3aR,4R,6R,6aS)-6-((R)-2,2-Dimethyl-[1,3]dioxolan-4-yl)-2,2-dimethyl-tetrahydro-furo[3,4-d][1,3]dioxol-4-yl]-but-2-enedioic acid 1-ethyl ester 4-methyl ester