Sodium cyanoborohydride → (2S)-2-(2-(N-Boc-N-2-picolylaminomethyl)pyridin-5-ylcarbonyl)amino-5-(5,6,7,8-tetrahydroquinolin-8-yl)aminovaleric Acid

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Reaction Steps

The compound obtained in Example 12-4 (149.9 mg) was dissolved in a dioxane/water (8/2) solution (7.5 ml). After the addition of 10% Pd—C (154.6 mg), the mixture was stirred for 4.5 hours under hydrogen atmosphere at room temperature. After the reaction, the catalyst was removed by filtration through celite and the solvent was removed by distillation under reduced pressure to obtain a crude product (100.2 mg). 75.4 mg of the crude product was dissolved in methanol (1.5 ml). Then, 5,6,7,8-tetrahydroquinolin-8-one (53.6 mg) and sodium cyanoborohydride (43.2 mg) were added. 25 drops of acetic acid was added to adjust the pH of the mixture to about 5. The mixture was stirred for 22 hours at room temperature. After the reaction, the solvent was removed by distillation. The residue was purified by silica gel column chromatography (5 g, chloroform/methanol=10/1) to obtain the title compound (30.6 mg) as white foam.

Provenance & Evidence