CON(C)[C:4](=[O:9])[CH2:5][CH:6]([CH3:8])[CH3:7].[CH3:11][C:12]1[CH:13]=[C:14]([CH:18]=[CH:19][CH:20]=1)[CH2:15][Mg]Cl>>[CH3:7][CH:6]([CH3:8])[CH2:5][C:4](=[O:9])[CH2:11][C:12]1[CH:13]=[C:14]([CH3:15])[CH:18]=[CH:19][CH:20]=1The reaction and treatment were carried out in the same manner as in Example 36-b) using N-methoxy-N-methyl-3-methylbutanamide and 3-methylbenzyl magnesium chloride to obtain a title compound as a light yellow oily substance.
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