Isobutyric acid (2S,3S,4R,5R,6S)-6-[(2S,3S,4S,5R,6R)-2-bromomethyl-3-(2-chloro-acetoxy)-5-phenylsulfanyl-6-(2,2,2-trichloro-acetimidoyloxy)-tetrahydro-pyran-4-yloxy]-4-hydroxy-5-iodo-2,4-dimethyl-tetrahydro-pyran-3-yl ester 、
[(2S,3S,4S,5R,6R)-6-[[(2S)-8-acetyloxy-9-hydroxy-1-oxo-3,4-dihydro-2H-anthracen-2-yl]oxy]-2-(bromomethyl)-4-hydroxy-5-phenylsulfanyloxan-3-yl] 2-chloroacetate 在
4 A molecular sieve 、
叔丁基二甲硅基三氟甲磺酸酯 作用下,
以
二氯甲烷 为溶剂,
反应 3.5h,
以21%的产率得到Chloro-acetic acid (2R,3R,4S,5S,6S)-2-((S)-8-acetoxy-9-hydroxy-1-oxo-1,2,3,4-tetrahydro-anthracen-2-yloxy)-6-bromomethyl-5-hydroxy-3-phenylsulfanyl-tetrahydro-pyran-4-yl ester