Benzyl chloroformate → (+)-Benzyl[7-(2-chlorophenyl)-5-fluoro-2,3-dihydro-1-benzofuran-2-yl]methylcarbamate

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Reaction Steps

Treatment of (±)-1-[7-(2-chlorophenyl)-5-fluoro-2,3-dihydro-1-benzofuran-2-yl]methanamine (2.92 g, 10.5 mmol) with diisopropylethylamine (1.70 g, 13.1 mmol) and benzyl chloroformate (1.97 g, 11.6 mmol) generally according to the procedure described for Intermediate 12 provided 3.02 (70%) of (±)-benzyl[7-(2-chlorophenyl)-5-fluoro-2,3-dihydro-1-benzofuran-2-yl]methylcarbamate as a colorless oil. Rf=0.76 (silica, ethyl acetate:hexanes 1:9); Anal. calcd. for C23H19ClFNO3.0.5H2O: C, 65.64; H, 4.79; N, 3.33. Found: C, 65.28; H, 4.73; N, 3.18. Chiral HPLC separation of (±)-benzyl[7-(2-chlorophenyl)-5-fluoro-2,3-dihydro-1-benzofuran-2-yl]methylcarbamate (Chiralcel OJ, hexane:ethanol 1:1) provided two fractions. Fraction 1 (Rt=9.322 min, Chiralcel OJ, hexane:ethanol 1:1); Fraction 2 (Rt=13.646 min, Chiralcel OJ, hexane:ethanol 1:1).

Provenance & Evidence