Chloro-acetic acid (2S,3R,4S,5R,6R)-6-((R)-8-acetoxy-9-hydroxy-1-oxo-1,2,3,4-tetrahydro-anthracen-2-yloxy)-2-bromomethyl-5-phenylsulfanyl-4-triethylsilanyloxy-tetrahydro-pyran-3-yl ester 在
吡啶 、 4 A molecular sieve 、
氢氟酸 作用下,
以
四氢呋喃 、
吡啶 为溶剂,
以100%的产率得到Chloro-acetic acid (2S,3S,4S,5R,6R)-6-((R)-8-acetoxy-9-hydroxy-1-oxo-1,2,3,4-tetrahydro-anthracen-2-yloxy)-2-bromomethyl-4-hydroxy-5-phenylsulfanyl-tetrahydro-pyran-3-yl ester