反应 #170663

反应方程式

(Z)-2-bromomethyl-2-butenedioic acid dimethyl ester

methyl magnesium bromide

hydrochloric acid

ammonium chloride

→

titled compound

2-Methyl-3-methylenesuccinic acid dimethyl ester

溶剂

diethyl ether

hexamethylphosphoric acid triamide

反应条件

后处理

1. 1
   萃取extracted with diethyl ether (200 ml)
2. 2
   洗涤The resulting organic layer was washed with water twice
3. 3
   干燥dried over anhydrous sodium sulfate
4. 4
   浓缩concentrated under reduced pressure
5. 5
   其他The resulting residue was purified by silica gel column chromatography (eluent: n-hexane/chloroform=1/1 to 0/1)

实验过程

To a solution of (Z)-2-bromomethyl-2-butenedioic acid dimethyl ester (19.3 g) and hexamethylphosphoric acid triamide (70 ml) in diethyl ether (200 ml) was added dropwise methyl magnesium bromide (1.12 M solution in tetrahydrofuran, 100 ml) over 1 hour at −20° C. and stirred for additional 1 hour. To this reaction mixture were added a 6M aqueous solution of hydrochloric acid (18 ml) and a saturated aqueous solution of ammonium chloride (100 ml), and then the mixture was warmed to room temperature and extracted with diethyl ether (200 ml). The resulting organic layer was washed with water twice, followed by a saturated aqueous solution of sodium chloride once, dried over anhydrous sodium sulfate, and concentrated under reduced pressure. The resulting residue was purified by silica gel column chromatography (eluent: n-hexane/chloroform=1/1 to 0/1) to give the titled compound (9.92 g).

来源