2-[(2S,3R,5R)-2-[[tert-butyl(dimethyl)silyl]oxymethyl]-5-(5-methyl-2,4-dioxopyrimidin-1-yl)oxolan-3-yl]acetaldehyde 、 1-((2R,4S,5R)-5-Aminomethyl-4-triethylsilanyloxy-tetrahydro-furan-2-yl)-5-methyl-1H-pyrimidine-2,4-dione 在
3 A molecular sieve 、 sodium cyanoborohydride 作用下,
以
甲醇 为溶剂,
以65%的产率得到1-((2R,4S,5S)-5-(((tert-butyldimethylsilyl)oxy)methyl)-4-(2-((((2R,3S,5R)-5-(5-methyl-2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)-3-((triethylsilyl)oxy)tetrahydrofuran-2-yl)methyl)amino)ethyl)tetrahydrofuran-2-yl)-5-methylpyrimidine-2,4(1H,3H)-dione