Dicyclohexylcarbodiimide → 4-(2,5-Anhydro-4-bromo-3,4-dideoxy-D-erythropentonoyl)-1-piperazinecarboxylic acid phenylmethyl ester

Beteiligte Stoffe

Reaktionsschritte

A mixture of 0.941 g of product from Example 150, 0.652 g of 1-hydroxybenzotriazole, 1.17 g of 1-benzyloxycarbonyl piperazine, 1.39 g of dicyclohexylcarbodiimide and 8 ml of dry methylene chloride is stirred at room temperature for 1 hour. Five ml of dimethylformamide is added and the stirring continued overnight at room temperature. The reaction mixture is diluted with water and extracted with chloroform. The organic layer is dried, concentrated in vacuo and the residue purified by chromatography (silica gel: 10-80% ethyl acetate/hexane) to give 1.1 g of the desired product.

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