反应 #1178434

反应方程式

oxone

A3

3-N-[(4-chlorophenyl)]-4-N-{[4-(3-oxomorpholin-4-yl)phenyl]}-(S)-thiazolidine-3,4-dicarboxamide

→

3-N-[(4-chlorophenyl)]-4-N-{[4-(3-oxomorpholin-4-yl)phenyl]}-(S)-1,1-dioxo-1λ6-thiazolidine-3,4-dicarboxamide

溶剂

water

methanol

water

反应条件

后处理

1. 1
   其他the precipitate formed
2. 2
   过滤is filtered off
3. 3
   其他dried

实验过程

3.1 A solution of 4.54 g (54.0 mmol) of sodium hydrogencarbonate and 3.60 g (27.0 mmol) of 2-(S)-thiazolidine-4-carboxylic acid in 50 ml of water is heated to 80° C., and 8.46 g (54.0 mmol) of 4-chlorophenyl isocyanate are added. The reaction mixture is stirred at this temperature for 1 hour. The mixture is allowed to cool, and the precipitate formed is filtered off. The filtrate is acidified using 1N HCl, and the precipitate formed is filtered off and dried, giving (S)-3-(4-chlorophenylcarbamoyl)thiazolidine-4-carboxylic acid as a colourless solid; ESI 287. 3.2 498 mg (2.60 mmol) of N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride (DAPECI) are added to a solution of 573 mg (2.00 mmol) of (S)-3-(4-chlorophenylcarbamoyl)thiazolidine-4-carboxylic acid and 384 mg (2.00 mmol) of 4-(4-aminophenyl)morpholin-3-one in 4 ml of dimethylformamide (DMF), and the mixture is stirred at room temperature for 18 hours. The reaction mixture is added to saturated sodium hydrogencarbonate solution, and the precipitate formed is filtered off, giving 3-N-[(4-chlorophenyl)]-4-N-{[4-(3-oxomorpholin-4-yl)phenyl]}-(S)-thiazolidine-3,4-dicarboxamide (“A3”) as a colourless solid; ESI 461. 3.3 A solution of 1.9 g of oxone in 30 ml of water is added to a suspension of 450 mg (0.976 mmol) of “A3” in 50 ml of methanol, and the reaction mixture is stirred at room temperature for 24 hours. The reaction mixture is added to water, and the precipitate formed is filtered off and dried, giving 3-N-[(4-chlorophenyl)]-4-N-{[4-(3-oxomorpholin-4-yl)phenyl]}-(S)-1,1-dioxo-1λ6-thiazolidine-3,4-dicarboxamide (“A4”) as a colourless solid; ESI 493.

来源