Dichloromethane → (1S,4aS,6S,7R,7aR)-6,7-epoxy-1,4a,5,6,7,7a-hexahydro-7-methyl-1-(methylcarbamoyloxy)cyclopenta[c]-pyrane-4-carboxylic acid 4-methylpiperazylamide

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A dichloromethane solution containing 400 mg of (1S,4aS,6S,7R,7aR)-6,7-epoxy-1,4a,5,6,7,7a-hexahydro-7-methyl-1-(methylcarbamoyloxy)cyclopenta[c]-pyrane-4-carboxylic acid described in Example 1 was cooled with ice followed by addition of 0.20 ml of 1-methylpiperazine, 2 ml of triethylamine and 301 mg of 2-chloro-1,3-dimethylimidazolinium chloride and stirring for 15 hours at room temperature. The reaction mixture was then extracted with dichloromethane. After washing the organic phase with saturated aqueous sodium bicarbonate and brine, it was dried over anhydrous 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 dichloromethane-methanol eluate in the form of (1S,4aS,6S,7R,7aR)-6,7-epoxy-1,4a,5,6,7,7a-hexahydro-7-methyl-1-(methylcarbamoyloxy)cyclopenta[c]-pyrane-4-carboxylic acid 4-methylpiperazylamide (264 mg, yield: 50%). The physicochemical properties of this compound are described in Table 5, Compound No. 20.

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