反应 #1178437

反应方程式

4-nitrophenyl chloroformate

2-amino-5-chloropyridine

pyridine

(2R,4R)-4-hydroxy-2-[4-(2-oxo-2H-pyridin-1-yl)phenylcarbamoyl]pyrrolidinium chloride

N-ethyldiisopropylamine

→

1-N-[(5-chloropyridin-2-yl)]-2-N-{[4-(2-oxo-2H-pyridin-1-yl)phenyl]}-(2R,4R)-4-hydroxypyrrolidine-1,2-dicarboxamide

溶剂

dichloromethane

反应条件

后处理

1. 1
   workup.STIRRINGthe reaction mixture is stirred at room temperature for 18 hours
2. 2
   其他The reaction mixture is evaporated
3. 3
   其他the residue is chromatographed on a silica-gel column with dichloromethane/methanol 95:5 as eluent

实验过程

894 mg (4.43 mmol) of 4-nitrophenyl chloroformate are added to a solution of 570 mg (4.43 mmol) of 2-amino-5-chloropyridine and 0.73 ml (9.0 mmol) of pyridine in 50 ml of dichloromethane, and the mixture is stirred at room temperature for 1 hour. 1.49 g (4.43 mmol) of (2R,4R)-4-hydroxy-2-[4-(2-oxo-2H-pyridin-1-yl)phenylcarbamoyl]pyrrolidinium chloride and 1.5 ml (9.0 mmol) of N-ethyldiisopropylamine are added to the resultant suspension, and the reaction mixture is stirred at room temperature for 18 hours. The reaction mixture is evaporated, and the residue is chromatographed on a silica-gel column with dichloromethane/methanol 95:5 as eluent, giving 1-N-[(5-chloropyridin-2-yl)]-2-N-{[4-(2-oxo-2H-pyridin-1-yl)phenyl]}-(2R,4R)-4-hydroxypyrrolidine-1,2-dicarboxamide (“A6”) as a colourless solid, ESI 454.

来源