((2S,3R)-6-{(4S,5S,6R)-6-[(1S,4S)-4-(3-Benzyloxy-phenyl)-4-methoxy-1-methyl-butyl]-2,2,5-trimethyl-[1,3]dioxan-4-ylmethyl}-6-hydroxy-3,5,5-trimethyl-tetrahydro-pyran-2-yl)-acetic acid methyl ester 在
重铬酸吡啶 作用下,
以30%的产率得到(R)-8-{(4S,5R,6R)-6-[(S)-3-(3-Benzyloxy-phenyl)-3-methoxy-propyl]-2,2,5-trimethyl-[1,3]dioxan-4-yl}-4,6,6-trimethyl-3,7-dioxo-octanoic acid methyl ester