HCID 57278509, compound → HCID 86755121, compound

Participants

Reaction Steps

1.35 g of (1S,4aS,6R,7S,7aR)-6,7-epoxy-7-methyl-1-(methylcarbamoyloxy)-1,4a,5,7a-tetrahydrocyclopenta[c]pyrane-4-carboxylic acid benzylester described in Step 5 of Example 1 were dissolved in ethyl acetate followed by suspension of 60 mg of 5% palladium-carbon catalyst and stirring for 24 hours under hydrogen gas atmosphere at 1 atm. After filtering out the insoluble matter, the filtrate was concentrated. The residue was dissolved in methanol-ether followed by dropwise addition of 3.0 ml of trimethylsilyldiazomethane (2.0 M, hexane solution) and stirring for 30 minutes at room temperature. The reaction mixture was then extracted with ethyl acetate. After washing the organic phase with brine, it was dried over magnesium sulfate. After distilling off the solvent under reduced pressure, the residue was purified by silica gel chromatography to obtain a colorless powder from the hexane-ether eluate in the form of (1S,4aS,6R,7S,7aR)-6,7-epoxy-7-methyl-1-(methylcarbamoyloxy-1,4a,5,6,7,7a-hexahydrocyclopenta[c]pyrane-4-carboxylic acid methylester (720 mg, yield: 68%). The physicochemical properties of this compound are described in Table 12, Compound No. 57.

Provenance & Evidence