Diethylmethoxyborane → HCID 131720247, compound

Participants

Reaction Steps

For instance, methyl (3R,6E)-3-[(tert-butyldimethylsilyl)oxy]-7-(2,4-dichlorophenyl)-5-oxo-6-heptenoate (which is one of the compounds of the formula (1)) is subjected to the tert-butyldimethylsilyl removing step using hydrogen fluoride in the manner as described in Japanese Patent Provisional Publication H5(1993)-178841, to give methyl (3R, 6E)-7-(2,4-dichlorophenyl)-3-hydroxy-5-oxo-6-heptenoate. The obtained ester is then subjected to Syn reduction using diethylmethoxyborane and sodium borohydride (NaBH4), to give methyl (3R,5S,6E)-7-(2,4-dichlorophenyl)-3,5-dihydroxy-6-heptenoate. Subsequently, thus obtained ester is treated with sodium hydroxide and hydrochloric acid in the manner as described in Journal of Medicinal Chemistry, 1985, vol.28, No.3, pp.347-358, to give (+)-trans-(E)-6-[2-(2,4-dichlorophenyl)-ethenyl] 3,4,5,6-tetrahydro-4-hydroxy-2H-pyran-2-on which has the 3-hydroxy-3-methylglutaryl Coenzyme A reductase preventive action.

Provenance & Evidence