反応 #157483

反応方程式

2-chloroethylamine hydrochloride

3-bromoaniline

DMSO

K2CO3

→

2-(3-bromophenyl)-1,2,5-thiadiazolidine 1,1-dioxide

溶媒

CH3CN

Et2O

H2O

EtOAc

反応条件

後処理

1. 1
   濃縮The solution was concentrated
2. 2
   その他the residue dried in vacuo
3. 3
   抽出The residue was then extracted with two 15 mL portions of Et2O
4. 4
   洗浄then washed with H2O and brine
5. 5
   乾燥dried over Na2SO4
6. 6
   濃縮concentrated
7. 7
   workup.STIRRINGAfter stirring at room temperature for 2 hr the mixture
8. 8
   抽出extracted twice with EtOAc
9. 9
   洗浄the combined organics washed with H2O and brine
10. 10
    濃縮then concentrated
11. 11
    その他The residue was recrystallized from EtOAc/hexanes

実験手順

A solution of SO2Cl2 (12.6 mL, 0.155 mol) and 2-chloroethylamine hydrochloride (3.0 g, 25.9 mmol) in CH3CN (100 mL) was stirred at 75° C. for 16 hr. The solution was concentrated and the residue dried in vacuo. The residue was then extracted with two 15 mL portions of Et2O and the combined washes then added dropwise to a solution of 3-bromoaniline (1.70 mL, 15.5 mmol) and TEA (7.20 mL, 51.7 mmol) in Et2O (15 mL) at −78° C. After stirring at room temperature for 16 hr, the mixture was diluted with EtOAc then washed with H2O and brine, dried over Na2SO4 and concentrated. To the residue was added DMSO (100 mL) and K2CO3 (3.60 g, 26.0 mmol). After stirring at room temperature for 2 hr the mixture was poured into H2O (500 mL), extracted twice with EtOAc and the combined organics washed with H2O and brine then concentrated. The residue was recrystallized from EtOAc/hexanes to give 2-(3-bromophenyl)-1,2,5-thiadiazolidine 1,1-dioxide as a light brown solid. 1H NMR (400 MHz, DMSO-d6) δ ppm 3.48-3.49 (m, 2H), 3.82-3.85 (m, 2H), 7.15 (d, J=8.0 Hz, 1H), 7.23 (d, J=8.0 Hz, 1H), 7.29-7.33 (m, 2H), 7.85 (br s, 1H).

出典