(4R,7R,7aS)-3,7-Bis-(tert-butyl-dimethyl-silanyloxy)-6-methyl-2,4,7,7a-tetrahydro-benzofuran-4-carboxylic acid ethyl ester 在
间氯过氧苯甲酸 作用下,
以45%的产率得到(3aS,4S,7S,7aS)-7-(tert-Butyl-dimethyl-silanyloxy)-3a-hydroxy-6-methyl-3-oxo-2,3,3a,4,7,7a-hexahydro-benzofuran-4-carboxylic acid ethyl ester