Sodium borohydride → HCID 53943144, compound

Participants

Reaction Steps

Using 2,3-dimethoxy-6,7,8,9-tetrahydro-5H-benzocyclohepten-5-one (10 g), powdery sodium methoxide [prepared by subjecting a 28% methanol solution of sodium methoxide (40 g) to concentration to dryness under reduced pressure] and dimethyl carbonate (150 g), a condensation reaction is carried out in a manner as that described in Example 42. The resulting methyl ester of 2,3-dimethoxy-5-oxo-6,7,8,9-tetrahydro-5H-benzocycloheptene-6-carboxylic acid is dissolved in a mixture of methanol (100 ml) and methylene chloride (100 ml). The solution is subjected to reduction in a manner as that described in Example 42, using sodium borohydride (2 g). The product is purified by silica gel column chromatography (hexane:ethyl acetate=2:1-1:1) to afford 2,3-dimethoxy-5-hydroxy-6,7,8,9-tetrahydro-5H-benzocycloheptene-6-carboxylic acid methyl ester (8 g) as a pale yellow oil.

Provenance & Evidence