Triethylamine → N-[(2-Adamantyloxy)carbonyl]-alpha-methyl-D-tryptophan methyl ester

Participants

Reaction Steps

To a stirred solution of 2-adamantylchloroformate (0.965 g, 4.5 mmol) in dry THF (10 mL) was added a solution of α-methyl-D-tryptophan methyl ester (0.928 g, 4 mmol) in dry THF (20 mL) followed by a solution of triethylamine (0.808 g, 8 mmol) in dry THF (20 mL) dropwise. After 15 minutes, the reaction mixture was filtered, the solvent removed in vacuo and column chromatographed using 2% MeOH:98% CH2Cl2 as eluant to yield the title compound (1.42 g, 89%) as a syrup. IR (film) 1740-1695 b.r cm-1 ; NMR (CDCl3) δ1.50-1.60 (2H, m), 1.67 (3H, s), 1.70-2.10 (12H, m), 3.38 (1H, d, J =14.5Hz), 3.50-3.60 (1H, br.s), 3.68 (3H, s), 4.86 (1H, br.s), 5.28 (1H, br.s), 6.93 (1H, d, J 2.4Hz); 7.04-7.10 (2H, m), 7.33 (1H, d, J 8.2Hz) 7.54 (1H, d, J 7.8Hz), 8.18 (1H, br.s).

Provenance & Evidence