(1R,3R,4S,5S,7R)-4-[tert-butyl(dimethyl)silyl]oxy-1-[[tert-butyl(dimethyl)silyl]oxymethyl]-3-(2,4-dioxopyrimidin-1-yl)-2-oxa-9-thia-6-azaspiro[4.4]nonane-7-carboxylic acid 在
N-羟基丁二酰亚胺 、
盐酸-N-乙基-Nˊ-(3-二甲氨基丙基)碳二亚胺 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
以96%的产率得到(3R,5S,6R,8R,9S)-9-(tert-Butyl-dimethyl-silanyloxy)-6-(tert-butyl-dimethyl-silanyloxymethyl)-8-(2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-yl)-7-oxa-1-thia-4-aza-spiro[4.4]nonane-3-carboxylic acid amide