(3R,6R)-6-[(1S)-1,2-bis[[tert-butyl(dimethyl)silyl]oxy]ethyl]-3-methoxy-1,4-dioxan-2-ol 、
Silvestrol aglycone; (1R,2R,3S,3aR,8bS)-2,3,3a,8b-四氢-1,6,8b-三羟基-8-甲氧基-3a-(4-甲氧基苯基)-3-苯基-1H-环戊并[b]苯并呋喃-2-甲酸甲酯 在
dimethyl azodicarboxylate 、
三苯基膦 作用下,
以
甲苯 为溶剂,
反应 3.0h,
以71%的产率得到methyl (1R,2R,3S,3aR,8bS)-6-[[(2S,3R,6R)-6-[(1S)-1,2-bis[[tert-butyl(dimethyl)silyl]oxy]ethyl]-3-methoxy-1,4-dioxan-2-yl]oxy]-1,8b-dihydroxy-8-methoxy-3a-(4-methoxyphenyl)-3-phenyl-2,3-dihydro-1H-cyclopenta[b][1]benzofuran-2-carboxylate