反应详情

To a mixture of 3,5-dichloropyrazine-2-carbonitrile (500 mg, 2.84 mmol) and D-valinamide HCl salt (476 mg, 3.12 mmol) in AcCN (10 mL) was added DIPEA (1.11 mL, 6.25 mmol). After stirring at room temperature for 4 h, it was diluted with EtOAc, washed with sat. NaHCO3, organic layer was separated and washed with brine, dried and concentrated to give (R)-2-(6-chloro-5-cyanopyrazin-2-ylamino)-3-methylbutanamide (740 mg). Step 2: To a mixture of (R)-2-(6-chloro-5-cyanopyrazin-2-ylamino)-3-methylbutanamide (100 mg, 0.394 mmol) in Dioxane (2 mL) was added 3-aminoquinoline (71 mg, 0.492 mmol), Pd(OAc)2 (18 mg, 0.079 mmol), BINAP (49 mg, 0.079 mmol) and K2CO3 (163 mg, 1.18 mmol). After heating at 95° C. for 5 h, the mixture was filtered, the filtrate was concentrated and purified by preparative HPLC to give (R)-2-(5-cyano-6-(quinolin-3-yl)pyrazin-2-ylamino)-3-methylbutanamide (113 mg).

1. washwashed with sat. NaHCO3, organic layer
2. customwas separated
3. washwashed with brine
4. customdried
5. concentrationconcentrated