[CH3:1][NH:2][CH3:3].ClCCl.[CH3:7][O:8][C:9]([C:11]1[C@H:12]2[CH2:29][C@@H:28]3[O:30][C@:27]3(C)[C@@H:13]2[C@H:14]([O:17][C:18](OC2C=CC=CC=2)=[O:19])[O:15][CH:16]=1)=[O:10]>CCCCCC.C(OCC)(=O)C>[CH3:7][O:8][C:9]([C:11]1[C@H:12]2[CH2:29][C@@H:28]3[O:30][C@@H:27]3[C@@H:13]2[C@H:14]([O:17][C:18](=[O:19])[N:2]([CH3:3])[CH3:1])[O:15][CH:16]=1)=[O:10]5 ml of a 50% aqueous dimethylamine solution were added to a dichloromethane solution containing 198 mg of (1S,4aS,6S,7R,7aR)-6,7-epoxy-1,4a,5,6,7,7a-hexahydro-7-methyl-1-(phenoxycarbonyloxy)cyclopenta[c]pyrane-4-carboxylic acid methylester described in Example 10 followed by stirring for 10 minutes at room temperature. The reaction mixture was then extracted with dichloromethane. After washing the organic phase with 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 hexane-ethyl acetate eluate in the form of (1S,4aS,6S,7R,7aR)-1-(dimethylcarbamoyloxy)-6,7-epoxy-1,4a,5,6,7,7a-hexahydrocyclopenta[c]pyrane-4-carboxylic acid methylester (140 mg, yield: 83%). The physicochemical properties of this compound are described in Table 7, Compound No. 31.
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