Dicyclohexylcarbodiimide → N-Benzyloxy-t-butoxycarbonyl-threonine amide

Beteiligte Stoffe

Reaktionsschritte

A solution of 8.76 g of t-butoxycarbonyl threonine and the free amine from 6.4 g of O-benzylhydroxylamine HCl (ethyl acetate-sodium bicarbonate liberation) in 100 ml of tetrahydrofuran was treated with 6.12 g of N-hydroxybenzotriazole and 8.24 g of dicyclohexylcarbodiimide in 20 ml of tetrahydrofuran. The mixture was stirred under nitrogen for 26 hours, filtered, and evaporated in vacuo. The residue was chromatographed on a 300 g silica gel column (elution with chloroform and chloroform/ethyl acetate (3:1) yielding 7.2 g of compound. Crystallization from ether-hexane gave 4.18 g of the title compound.

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