Diethylamine → methyl(2S)-3,3-dimethyl-2-{3-[(1-methyl-1H-benzimidazol-2-yl)methyl]-2-oxoimidazolidin-1-yl}butanoate

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

A solution of the product of Example 148D (0.19 g) in N,N-dimethylformamide (3.5 mL) was treated with diethylamine (0.35 mL), stirred at 25° C. for 1.5 hours and concentrated. A solution of the residue in dichloroethane (7 mL) was treated with bis-(p-nitrophenyl) carbonate (0.128 g, 1.2 equivalents), stirred at 60° C. for 16 hours and concentrated. The residue was chromatographed on silica gel, eluting with ethyl acetate:dichloromethane (3:2) to give 80 mg (64%) of the title compound.

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