4-Methylmorpholine → 4-[2-(2,2,2-Trifluoroethyl)guanidino]-2-[5-(2-benzyloxycarbonylaminoacetylamino)pentyl]pyrimidine

Participants

Reaction Steps

To a solution of N-benzyloxycarbonylglycine (0.21 g.) in freshly distilled THF (5 ml.) was added N-methylmorpholine (0.1 g.). The resulting solution was stirred with cooling in an ice-salt bath, and a solution of i-butyl chloroformate (0.136 g.) in a small volume of THF was added in one portion. A precipitate formed immediately, and the mixture was stirred for cooling for 5 minutes. A solution of 4-[2-(2,2,2-trifluoroethyl)guanidino]-2-(5-aminopentyl)pyrimidine (0.35 g.) in THF (10 ml.) was gradually added. The mixture was stirred at room temperature for 2 hours, then evaporated in vacuo. Sodium bicarbonate solution was added to the residue and the mixture extracted with EtOAc. The extract was dried (MgSO4) and evaporated to give a pale yellow oil which was purified by medium pressure chromatography, eluting with 5% v/v MeOH in methylene chloride to give 4-[2-(2,2,2-trifluoroethyl)guanidino]-2-[5-(2-benzyloxycarbonylaminoacetylamino)pentyl]pyrimidine (0.17 g.) which was used without further purification.

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