反应 #1771996

反应方程式

dichloroacetic acid

Boc-norvalinol

toluene

EDC

→

Boc-norvalinal

溶剂

dimethylsulfoxide

反应条件

后处理

1. 1
   workup.ADDITIONAfter addition
2. 2
   温度to warm to room temperature over a period of 2 h
3. 3
   浓缩The reaction mixture was concentrated
4. 4
   其他to remove the toluene
5. 5
   workup.DISSOLUTIONdissolved in ethyl acetate
6. 6
   洗涤The solution was washed successively with 1N sodium bisulfate, saturated sodium bicarbonate and brine
7. 7
   干燥dried over sodium sulfate
8. 8
   过滤filtered
9. 9
   浓缩concentrated

实验过程

To Boc-norvalinol (7.77 g, 38 mmol), in anhydrous dimethylsulfoxide (153 mL) and toluene (153 mL) was added EDC (73.32 g, 382 mmol). After the solution was cooled to 0° C., dichloroacetic acid (15.8 mL, 191 mmol) was added dropwise. After addition was complete, the reaction was stirred for 15 min. The solution was allowed to warm to room temperature over a period of 2 h. The reaction mixture was concentrated to remove the toluene, then dissolved in ethyl acetate. The solution was washed successively with 1N sodium bisulfate, saturated sodium bicarbonate and brine, dried over sodium sulfate, filtered and concentrated to afford crude Boc-norvalinal which was used directly in the next step. TLC Rf=0.84 (40% ethyl acetate/hexanes).

来源