Dichloromethane → N-(N'-BOC-aminoethyl)-N-[(1-thyminyl)-propanoyl]glycine ethyl ester

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Reaction Conditions

Reaction Steps

N-(N′-BOC-aminoethyl)glycine ethyl ester (1 g, 0.0041 mol) was dissolved in DMF (12 mL). DhbtOH (0.73 g, 0.0045 mol) and 3-(1-thyminyl)propanoic acid (0.89 g, 0.0045 mol) were added. Methylene chloride (12 mL) was then added and the mixture was cooled to 0° C. in an ice bath. After addition of DCC (1.01 g, 0.0049 mol), the mixture was stirred at 0° C. for 2 h, followed by 1 h at room temperature. The precipitated DCU was removed by filtration, washed with methylene chloride (25 mL), and a further amount of methylene chloride (50 mL) was added to the filtrate. The organic phase was extracted with sodium hydrogen carbonate (1 volume saturated diluted with 1 volume water, 6×100 mL), potassium sulfate (1 volume saturated diluted with 4 volumes water, 3×100 mL), and saturated aqueous sodium chloride (1×100 mL), dried over magnesium sulfate, and evaporated to dryness, in vacuo. The solid residue was suspended in methylene chloride (15 mL), and stirred for 1 h. The precipitated DCU was removed by filtration and washed with methylene chloride. The filtrate was evaporated to dryness in vacuo, and the residue purified by column chromatography on silica gel, eluting with a mixture of methanol and methylene chloride (gradient from 1 to 6% methanol in methylene chloride). This afforded the title compound as a white solid (1.02 g, 59%). Anal. for C19H30N4O7, found (calc.) C, 53.15 (53.51); H, 6.90 (7.09); N, 12.76 (13.13). The compound showed satisfactory 1H and 13C-NMR spectra.

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