methyl (2E,4E,7S)-7-[tert-butyl(dimethyl)silyl]oxy-8-[(2S,6R)-2-[(2S,3R)-2-methoxy-3-methyl-4-trimethylsilyloxypent-4-enyl]-3,6-dihydro-2H-pyran-6-yl]-4-methylocta-2,4-dienoate 、
(2R,3R,4S,5S,6S,10R,11R,12R)-13-tert-butyldiphenylsilyloxy-3,5-isopropylidenedioxy-11-methoxy-2,4,6,10,12-pentamethyl-9-oxotridecanal 在
三氟化硼乙醚 作用下,
以
二氯甲烷 为溶剂,
反应 1.33h,
以87%的产率得到methyl (2E,4E,7S)-7-[tert-butyl(dimethyl)silyl]oxy-8-[(2S,6R)-2-[(2S,3R,6R,7S)-7-[(4S,5S,6S)-6-[(2S,6R,7R,8R)-9-[tert-butyl(diphenyl)silyl]oxy-7-methoxy-6,8-dimethyl-5-oxononan-2-yl]-2,2,5-trimethyl-1,3-dioxan-4-yl]-6-hydroxy-2-methoxy-3-methyl-4-oxooctyl]-3,6-dihydro-2H-pyran-6-yl]-4-methylocta-2,4-dienoate