焦碳酸二烯丙基酯 、
(R)-1-[(2R,4S,5R)-5-[Bis-(4-methoxy-phenyl)-phenyl-methoxymethyl]-4-(tert-butyl-dimethyl-silanyloxy)-tetrahydro-furan-2-yl]-5-hydroxy-5-methyl-dihydro-pyrimidine-2,4-dione 以87%的产率得到Carbonic acid allyl ester (R)-5-allyloxycarbonyloxy-1-[(2R,4S,5R)-5-[bis-(4-methoxy-phenyl)-phenyl-methoxymethyl]-4-(tert-butyl-dimethyl-silanyloxy)-tetrahydro-furan-2-yl]-5-methyl-2-oxo-1,2,5,6-tetrahydro-pyrimidin-4-yl ester