反应详情

Treatment of (±)-1-[5-fluoro-7-(2-methylphenyl)-2,3-dihydro-1-benzofuran-2-yl]methanamine (3.11 g, 12.1 mmol) with diisopropylethylamine (2.34 g, 18.1 mmol) and benzyl chloroformate (2.27 g, 13.3 mmol) generally according to the procedure described for Intermediate 12 gave 4.35 (92%) of (±)-benzyl[5-fluoro-7-(2-methylphenyl)-2,3-dihydro-1-benzofuran-2-yl]methylcarbamate as a colorless oil. Rf=0.83 (silica, ethyl acetate:hexanes 1:9); Anal. calcd. for C24H22FO3.0.2H2O: C, 72.97; H, 5.72; N, 3.55. Found: C, 72.8; H, 5.72; N, 3.48. Chiral HPLC separation of (±)-benzyl[5-fluoro-7-(2-methylphenyl)-2,3-dihydro-1-benzofuran-2-yl]methylcarbamate (Chiralcel OD, hexane:isopropanol 8:2) provided two fractions. Fraction 1 (Rt=7.269 min, Chiralcel OD, hexane:isopropanol 8:2); Fraction 2 (Rt=8.449 min, Chiralcel OD, hexane:isopropanol 8:2).