[CH3:1][N:2]([CH3:11])[C:3]1[CH:10]=[CH:9][C:6]([CH:7]=O)=[CH:5][CH:4]=1.[CH:12]([C:15]1[CH:21]=[CH:20][C:18]([NH2:19])=[CH:17][CH:16]=1)([CH3:14])[CH3:13].C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+].[NH4+].[Cl-].CCOC(C)=O>C1COCC1>[CH3:1][N:2]([CH3:11])[C:3]1[CH:10]=[CH:9][C:6]([CH2:7][NH:19][C:18]2[CH:20]=[CH:21][C:15]([CH:12]([CH3:14])[CH3:13])=[CH:16][CH:17]=2)=[CH:5][CH:4]=1To a 0.33 M solution of 4-(dimethylamino)benzaldehyde in THF at 0° C. was added 1.1 equiv of 4-isopropylaniline followed by 1.5 equiv of sodium triacetoxyborohydride. After allowing the reaction to warm to room temperature overnight, this mixture was poured into a separatory funnel containing aqueous NH4Cl/EtOAc. The organic layer was washed with brine, dried over anhydrous Na2SO4, filtered and concentrated. The crude material was further purified by flash chromatography, eluting with a gradient from 100% hexanes to 10% EtOAc/hexanes to provide the title compound as a white solid.
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