Triethylamine → 5,9-Bis(benzyloxymethyl)-1-oxa-4,7,10-triazacyclododecane-3,11-dione

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Reaction Steps

A solution of 1,5-diamino-1,5-dibenzyloxymethyl-3-aza-pentane (0.57 g, 1.7 mmol) (Example 6 (d)) and triethylamine (0.34 g, 3.4 mmol) in dichloromethane (10 ml) and a solution of diglycolic acid dichloride (0.29 g, 1.7 mmol) in dichloromethane (10 ml) were added simultaneously over 2.5 hours to vigorously stirred dichloromethane (10 ml) at 0° C. The solution was stirred at ambient temperature overnight, washed with water (2×30 ml), dried with sodium sulphate and evaporated. Yield 0.59 g (78%).

Provenance & Evidence