反应 #1798008

反应方程式

α-Bromo-o-tolunitrile

5-Bromo-2-chloro-3H-pyrimidin-4-one

Sodium hydride

lithium bromide

→

2-(5-bromo-2-chloro-6-oxo-6H-pyrimidin-1-ylmethyl)-benzonitrile

收率 34.1%

溶剂

EtOAc

DME

DMF

反应条件

后处理

1. 1
   workup.ADDITIONwas added
2. 2
   洗涤washed with brine
3. 3
   干燥dried (MgSO4)
4. 4
   浓缩concentrated in vacuo
5. 5
   其他Purification by silica gel chromatography (1:1:1 EtOAc/hexanes/CHCl3)

实验过程

5-Bromo-2-chloro-3H-pyrimidin-4-one (1.88 g, 9.0 mmol) was stirred in DME (25 mL)/DMF (5 mL) under nitrogen at 0° C. Sodium hydride (95%, 238 mg, 9.4 mmol) was added in portions. After 10 min, lithium bromide (1.56 g, 17.9 mmol) was added and the reaction stirred for 15 min at r.t. α-Bromo-o-tolunitrile (3.5 g, 17.9 mmol) was added, and the reaction stirred at 65° C. for 8 h. The solution was diluted with EtOAc, washed with brine, dried (MgSO4) and concentrated in vacuo. Purification by silica gel chromatography (1:1:1 EtOAc/hexanes/CHCl3) gave 997 mg (34%) of 2-(5-bromo-2-chloro-6-oxo-6H-pyrimidin-1-ylmethyl)-benzonitrile as a white solid. 1H NMR (400 MHz, CDCl3): δ8.11 (s, 1H), 7.73 (dd, 1H, J=7.6, 1.2 Hz), 7.58 (dt, 1H, J=7.6, 1.2 Hz), 7.45 (t, 1H, J=7.6 Hz), 7.16 (d, 1H, J=7.6 Hz), 5.69 (s, 2H). MS (ES) [m+H] calc'd for C12H7N3OBrCl, 324, 326, 328; found 324, 326, 328.

来源