2-Diazo-malonic acid (2R,3S,5R)-2-(tert-butyl-diphenyl-silanyloxymethyl)-5-(2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-yl)-tetrahydro-furan-3-yl ester methyl ester 在
dirhodium tetraacetate 作用下,
以
二氯甲烷 为溶剂,
反应 2.0h,
以72%的产率得到methyl (3S,3aR,4R,6R,6aS)-6-[[tert-butyl(diphenyl)silyl]oxymethyl]-4-(2,4-dioxopyrimidin-1-yl)-2-oxo-3a,4,6,6a-tetrahydro-3H-furo[2,3-c]furan-3-carboxylate