[CH2:1]([O:3][CH:4]1[CH2:9][CH2:8][CH2:7][CH2:6][C:5]1=[O:10])[CH3:2].C(O[CH:16](N(C)C)[N:17]([CH3:19])[CH3:18])(C)(C)C>>[CH3:16][N:17]([CH3:19])[CH:18]=[C:6]1[CH2:7][CH2:8][CH2:9][CH:4]([O:3][CH2:1][CH3:2])[C:5]1=[O:10]2-Ethoxy-cyclohexanone (142 mg, 1.0 mmol) was reacted with tert.-butoxy-bis-(dimethylamino)-methane using in analogous manner the procedure described in example 45a) to give crude title compound (232 mg) as a yellow oil which was used directly in the next step.
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