2-Diazo-malonic acid (2R,3S,5R)-2-(tert-butyl-diphenyl-silanyloxymethyl)-5-(5-methyl-2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-yl)-tetrahydro-furan-3-yl ester ethyl ester 在
dirhodium tetraacetate 作用下,
以
二氯甲烷 为溶剂,
反应 1.0h,
以65%的产率得到(3S,3aR,4R,6R,6aS)-6-(tert-Butyl-diphenyl-silanyloxymethyl)-4-(5-methyl-2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-yl)-2-oxo-hexahydro-furo[3,4-b]furan-3-carboxylic acid ethyl ester