[Li]C(CC)C.C1CCCCC1.[CH2:12]([NH:14][C:15]([C:17]1[C:26]2[C:21](=[CH:22][CH:23]=[CH:24][CH:25]=2)[CH:20]=[CH:19][CH:18]=1)=[O:16])[CH3:13].CN(CCN(C)C)C.[Mg+2].[Br-].[Br-].CCOCC.C(OO[O:53][C:54]([CH3:57])([CH3:56])[CH3:55])(=O)C1C=CC=CC=1>C1COCC1>[CH3:55][C:54]([CH3:57])([O:53][C:18]1[CH:19]=[CH:20][C:21]2[C:26](=[CH:25][CH:24]=[CH:23][CH:22]=2)[C:17]=1[C:15]([NH:14][CH2:12][CH3:13])=[O:16])[CH3:56]A solution of 1.3M s-BuLi in cyclohexane (34 mL, 44 mmol) was added dropwise to a -78° C. cooled solution of N-ethyl-1-naphthalenecarboxamide (20 mmol) and TMEDA (6.0 mL, 40 mmol) in THF (100 mL). After 30 min, MgBr2.Et2O (15.5 g, 60 mmol) was added portion wise, and the reaction was briefly warmed to ambient temperature then was recooled to -78° C. After 1 h at -78° C., t-butylperoxy benzoate (4.3 g, 22 mmol) was added. The resulting reaction was warmed to -30° C. and worked up in the usual manner, then was purified by chromatography with 3:7 ethyl acetate/hexanes to afford 1.7 g of desired compound as a white solid, a 33% yield. m.p. 126-127° C.
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