Chloro-acetic acid (2R,3S,4S,5R,6S)-3,5-diacetoxy-2-acetoxymethyl-6-fluoro-tetrahydro-pyran-4-yl ester 、
phenyl 4,6-di-O-benzylidene-2-deoxy-2-phthalimido-1-thio-β-D-glucopyranoside 在
2,6-二叔丁基-4-甲基吡啶 、
二氯二茂铪 、 4 A molecular sieve 、
silver trifluoromethanesulfonate 作用下,
以
二氯甲烷 为溶剂,
反应 6.0h,
以63%的产率得到Chloro-acetic acid (2R,3S,4S,5R,6R)-3,5-diacetoxy-2-acetoxymethyl-6-[(2R,4aR,6S,7R,8R,8aS)-7-(1,3-dioxo-1,3-dihydro-isoindol-2-yl)-2-phenyl-6-phenylsulfanyl-hexahydro-pyrano[3,2-d][1,3]dioxin-8-yloxy]-tetrahydro-pyran-4-yl ester