(3E,3aS,4S,6S,7S,7aR)-3-[(2E,4R,6E)-8-[(2R,3S,6R,8R,10S)-10-[tert-butyl(diphenyl)silyl]oxy-3-methyl-2-propan-2-yl-1,7-dioxaspiro[5.5]undecan-8-yl]-4,6-dimethylocta-2,6-dienylidene]-4-(hydroxymethyl)-6-methyl-7-tri(propan-2-yl)silyloxy-5,6,7,7a-tetrahydro-4H-1-benzofuran-3a-ol 在
N-甲基吲哚酮 、
四丙基高钌酸铵 、 4 A molecular sieve 作用下,
以
二氯甲烷 为溶剂,
以80%的产率得到(3E,3aS,4R,6S,7S,7aR)-3-[(2E,4R,6E)-8-[(2R,3S,6R,8R,10S)-10-[tert-butyl(diphenyl)silyl]oxy-3-methyl-2-propan-2-yl-1,7-dioxaspiro[5.5]undecan-8-yl]-4,6-dimethylocta-2,6-dienylidene]-3a-hydroxy-6-methyl-7-tri(propan-2-yl)silyloxy-5,6,7,7a-tetrahydro-4H-1-benzofuran-4-carbaldehyde