[NH2:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[CH:13]=[CH:12][CH:11]=[C:10]([Cl:14])[CH:9]=2)=[CH:4][C:3]=1[C:15]([CH3:18])([CH3:17])[OH:16].[CH3:19][C:20]([CH3:22])=O>C1(C)C=CC=CC=1.C1(C)C=CC(S(O)(=O)=O)=CC=1>[Cl:14][C:10]1[CH:9]=[C:8]([C:5]2[CH:6]=[CH:7][C:2]3[NH:1][C:20]([CH3:22])([CH3:19])[O:16][C:15]([CH3:18])([CH3:17])[C:3]=3[CH:4]=2)[CH:13]=[CH:12][CH:11]=1A mixture of (4-amino-3′-chloro-biphenyl-3-yl)-dimethyl-methanol (0.46 g, 1.8 mmol), acetone (0.16 g, 2.7 mmol), and p-toluenesulfonic acid (0.017 g, 0.09 mmol) in dry toluene (6 mL) was heated at 33° C. under a blanket of nitrogen overnight. Upon completion of the reaction, the toluene was removed and the compound purified via a flash chromatography (silica gel, 15% ethyl acetate/hexane) to give 6-(3-chloro-phenyl)-2,2,4,4-tetramethyl-1,4-dihydro-2H-benzo[d][1,3]oxazine (0.36 g, 68%) as a yellow oil. The oil was dissolved in ether at −78° C. and then treated with a solution of 1N HCl in ether to give the hydrochloride salt of the title compound as a yellow solid: 1H-NMR (DMSO-d6) δ 7.70 (bs, 1H), 7.61 (d, 1H, J=7.82 Hz), 7.52 (bs, 1H), 7.44 (m, 2H), 7.33 (d, 1H, J=8.21 Hz), 6.87 (d, 1H, J=7.85 Hz), 1.5 (s, 6H), 1.4 (s, 6H); MS (ESI) m/z 302 ([M+H]+, 100%); Anal. Calc. For C18H20ClNO: C, 63.91; H, 6.26; N, 4.14. Found: C, 64.08; H, 6.43; N, 4.14.
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