4-Methylmorpholine → Benzyl (tert-butoxycarbonyl)glycylglycinate

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Reaction Conditions

Reaction Steps

Boc-Gly-OH (17.52 g, 0.1 mole) in a mixture of CHCl3 (50 ml) and acetonitrile (50 ml) was cooled to -15° C. and EDCI (19.17 g, 0.1 mole) was added and stirred for 20 minutes. To this, a pre-cooled solution of H-Gly-OBzl.tosylate (37.1 g, 0.11 mole), NMM (12.09 ml, 0.11 mole) in CHCl3 (100 ml) was added and stirred overnight at room temperature. After removing the solvent, the residue was taken in CHCl3 and extracted with acid and base. Chloroform was removed under reduced pressure, triturated with pet. ether, filtered, washed with pet. ether and dried to obtain 30.2 g of I (yield: 93.7%), m.p. 82°-83° C. Rf2, 0.52; Rf4, 0.82. Anal. Calcd. for C16H22N2O5 : C, 59.61; H, 6.88; N, 8.69%. Found C, 59.43; H, 6.88; N, 8.35%

Provenance & Evidence