反应详情

Treatment of (±)-1-[4-(2,6-dimethylphenyl)-2,3-dihydro-1-benzofuran-2-yl]methanamine (1.2 g, 4.14 mmol) with diisopropylethylamine (0.803 g, 6.21 mmol) followed by benzyl chloroformate (0.848 g, 4.97 mmol) generally according to the procedure described for Intermediate 12 provided 1.52 g (95%) of (±)-benzyl {[4-(2,6-dimethylphenyl)-2,3-dihydro-1-benzofuran-2-yl]methyl}carbamate as a colorless oil. Anal. calcd. for C25H25NO3: C, 77.49; H, 6.5; N, 3.61. Found: C, 76.66; H, 6.31; N, 3.44. Chiral HPLC separation of (±)-benzyl {[4-(2,6-dimethylphenyl)-2,3-dihydro-1-benzofuran-2-yl]methyl}carbamate (Chiralcel OD, ethanol) provided two fractions. Fraction 1 (Rt=4.818 min, Chiralcel OD, ethanol); Fraction 2 (Rt=6.985 min, Chiralcel OD, ethanol).