(R)-methyl 2-((2-chloro-5-nitropyrimidin-4-yl)(isopropyl)amino)butanoate → (R)-2-chloro-7-ethyl-8-isopropyl-7,8-dihydropteridin-6(5H)-one

関与物質

反応条件

反応手順

Methyl (2R)-2-[(2-chloro-5-nitro-pyrimidin-4-yl)-isopropyl-amino]butanoate 22b (7.30 g, 23 mmol) was dissolved in 100 mL acetic acid followed by the addition of 5 g Raney nickel, repeated filled with hydrogen for three times. The reaction mixture was heated to 75° C., stirred for 2 hours and filtered. The filtrate was concentrated under reduced pressure, added with 30 mL of ice water resulting in the formation of precipitate. The precipitate was filtered. the filter cake was dried by heat to obtain the crude title compound (7R)-2-chloro-7-ethyl-8-isopropyl-5,7-dihydropteridin-6-one 22c (12.10 g, yield: 71.7%) as a gray solid, which was used in the next step without further furification.

情報源と証拠