[(2S,3S,6S)-6-[(2R)-3-[tert-butyl(dimethyl)silyl]oxy-2-[(3R)-3-[tert-butyl(dimethyl)silyl]oxy-4-[(2S,6R)-6-[[(4S,8R,11S)-8-methyl-11-propan-2-yl-1,5-dioxaspiro[5.5]undecan-4-yl]methyl]oxan-2-yl]butanoyl]oxypropyl]-2-hydroxy-4-(2-methoxy-2-oxoethylidene)-2-(2-methyl-5-oxopent-3-en-2-yl)oxan-3-yl] octanoate 在
70percent HF/pyridine 作用下,
以
四氢呋喃 为溶剂,
反应 2.0h,
以73%的产率得到[(1R,3S,7S,11S,12S,15S,17R,21R,23S)-11,21-dihydroxy-17-(hydroxymethyl)-13-(2-methoxy-2-oxoethylidene)-10,10-dimethyl-19-oxo-6,18,27,28,29-pentaoxatetracyclo[21.3.1.13,7.111,15]nonacos-8-en-12-yl] octanoate