(3aR,6S,7R,7aR)-7-(tert-Butyl-dimethyl-silanyloxy)-3a-hydroxy-3-[2-hydroxy-eth-(E)-ylidene]-6-methyl-2,3,3a,6,7,7a-hexahydro-benzofuran-4-carboxylic acid methyl ester 在
重铬酸吡啶 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
以90%的产率得到(3aR,6S,7R,7aR)-7-(tert-Butyl-dimethyl-silanyloxy)-3a-hydroxy-6-methyl-3-[2-oxo-eth-(E)-ylidene]-2,3,3a,6,7,7a-hexahydro-benzofuran-4-carboxylic acid methyl ester