N-(o-nitrobenzenesulfonyl)-L-phenylalanine tert-butyl ester 、
2,2-Dimethyl-propionic acid 3-((3aR,4R,6R,6aR)-6-hydroxymethyl-2,2-dimethyl-tetrahydro-furo[3,4-d][1,3]dioxol-4-yl)-2,6-dioxo-3,6-dihydro-2H-pyrimidin-1-ylmethyl ester 在
三苯基膦 、
偶氮二甲酸二乙酯 作用下,
以
四氢呋喃 为溶剂,
以93%的产率得到(S)-2-[{(3aR,4R,6R,6aR)-6-[3-(2,2-Dimethyl-propionyloxymethyl)-2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-yl]-2,2-dimethyl-tetrahydro-furo[3,4-d][1,3]dioxol-4-ylmethyl}-(2-nitro-benzenesulfonyl)-amino]-3-phenyl-propionic acid tert-butyl ester