反応 #50921

反応方程式

n-butyllithium

2,2-dimethyl-N-(6-thiomorpholin-4-yl-pyridin-3-yl)-propionamide

N,N,N′,N′-tetramethylethylenediamine

2,2,6,6,-tetramethylpiperidine

sodium thiosulfate pentahydrate

iodine

→

title compound

収率 63.4%

N-(4-Iodo-6-thiomorpholin-4-yl-pyridin-3-yl)-2,2-dimethyl-propionamide

収率 63.4%

溶媒

hexane

tetrahydrofuran

tert-butyl methyl ether

反応条件

後処理

1. 1
   温度After cooling again to −70° C.
2. 2
   workup.STIRRINGstirring
3. 3
   workup.WAITwas continued for 1 h
4. 4
   温度The suspension was warmed to −60° C.
5. 5
   その他the organic layer was separated
6. 6
   抽出The aqueous layer was extracted three times with 750-ml portions of tert-butyl methyl ether
7. 7
   乾燥the combined organic layers were dried (sodium sulfate)
8. 8
   その他evaporated

実験手順

Under argon) a solution of 75 g (268 mmol) 2,2-dimethyl-N-(6-thiomorpholin-4-yl-pyridin-3-yl)-propionamide, 187 g (1.61 mol) N,N,N′,N′-tetramethylethylenediamine and 85 g (604 mmol) 2,2,6,6,-tetramethylpiperidine in 750 ml tetrahydrofuran was cooled to −65° C. in a dry ice bath. Within 30 min, 805 ml (1.29 mol) of a 1.6 N n-butyllithium solution in hexane were added dropwise. The reaction mixture was allowed to warm up to −15° C. and was stirred for 3 h at this temperature. After cooling again to −70° C., 354 g (1.40 mol) iodine (dissolved in 1000 ml tetrahydrofuran) were added dropwise during 2 h and stirring was continued for 1 h. The suspension was warmed to −60° C. and was poured into 1000 ml of 30% sodium thiosulfate pentahydrate solution. Then, 750 ml tert-butyl methyl ether were added and the organic layer was separated. The aqueous layer was extracted three times with 750-ml portions of tert-butyl methyl ether and the combined organic layers were dried (sodium sulfate) and evaporated. Flash chromatography gave 68.9 g (63%) of the title compound as light brown crystals.

出典