反应详情

Treatment of (±)-1-{7-[3-(trifluoromethyl)phenyl]-2,3-dihydro-1-benzofuran-2-yl}methanamine (1.67 g, 5.06 mmol) with diisopropylethylamine (0.98 g, 7.59 mmol) followed by benzyl chloroformate (1.04 g, 7.59 mmol) generally according to the procedure described for Intermediate 12 provided 2.1 g (97%) of (±)-benzyl({7-[3-(trifluoromethyl)phenyl]-2,3-dihydro-1-benzofuran-2-yl}methyl)carbamate as a colorless oil. Anal. calcd. for C24H20F3NO3: C, 67.44; H, 4.72; N, 3.28. Found: C, 67.08; H, 5.05; N, 3.22. Chiral HPLC separation of (±)-benzyl ({7-[3-(trifluoromethyl)phenyl]-2,3-dihydro-1-benzofuran-2-yl}methyl)carbamate (Chiralpak OJ, isopropanol:carbon dioxide 15:85) provided two fractions. Fraction 1 (Rt=6.12 min, Chiralpak OJ, isopropanol:carbon dioxide 15:85); Fraction 2 (Rt=7.17 min, Chiralpak OJ, isopropanol:carbon dioxide 15:85).