Triethylamine → 10-(2,3-dimethoxy-5-methyl-1,4-benzoquinon-6-yl)-decanoyl-D-phenylalanine

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To a solution of p-nitrophenyl 10-(2,3-dimethoxy-5-methyl-1,4-benzoquinon-6-yl)decanoate (4.73 g, 10 mmol) and D-phenylalanine (1.65 g, 10 mmol) in N,N-dimethylformamide (30 ml), was added triethylamine (1.4 ml, 10 mmol). The mixture was stirred at room temperature for 2 days, whereupon the insoluble matter almost disappeared. The solvent was distilled off under reduced pressure and the residue was chromatographed on a column of silica gel (100 g). The column was washed well with chloroform and elution with chloroform-methanol-acetic acid (18:2:1, v/v) gave 10-(2,3-dimethoxy-5-methyl-1,4-benzoquinon-6-yl)decanoyl-D-phenylalanine (2.56 g), melting at 96°-98° C., after washing up in the usual way.

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