反应详情

Zinc powder (10 g, 155 mmol) was added portionwise to a suspension of 6-azido-4-(4-bromo-2-chlorophenylamino)-5-chloronicotinic acid methyl ester (27) (12.94 g, 31 mmol) in 3:1 dichloromethane/acetic acid (300 mL). After fifteen minutes the reaction mixture was poured into 700 mL ethyl acetate, washed with water, saturated sodium bicarbonate and brine. The organic solution was dried over NaSO4, filtered, and concentrated in vacuo to provide the desired product (28) as an off-white solid (11.85 g, 98%). MS (APCI+) m/z 390, 392, 394 (M+; Cl, Br pattern) detected.

1. washwashed with water, saturated sodium bicarbonate and brine
2. dry with materialThe organic solution was dried over NaSO4
3. filtrationfiltered
4. concentrationconcentrated in vacuo