反応 #40791

反応方程式

4,N-Diethyl-4,5-dihydro-pyrazole-1-carboxamidine hydrochloride

DiPEA

benzo[1,2,5]thiadiazole-4-sulfonylchloride

→

red/brown oil

収率 84.7%

Benzo[1,2,5] thiadiazole-4-sulfonic acid ethylamino-(4-ethyl-4,5-dihydro-pyrazol-1-yl)-methyleneamide

収率 84.7%

溶媒

DCM

反応条件

後処理

1. 1
   洗浄The mixture was washed with 5% NaHCO3 and 2 M NaOH
2. 2
   乾燥the organic layer dried over Na2SO4
3. 3
   その他the solvent evaporated in vacuo

実験手順

300 mg 4,N-Diethyl-4,5-dihydro-pyrazole-1-carboxamidine hydrochloride was suspended in 10 mL DCM. 0.53 mL DiPEA and 310 mg benzo[1,2,5]thiadiazole-4-sulfonylchloride were added and the mixture was stirred overnight at room temperature. The mixture was washed with 5% NaHCO3 and 2 M NaOH, the organic layer dried over Na2SO4 and the solvent evaporated in vacuo to yield 410 mg of a red/brown oil. The crude product was purified by flash chromatography (DCM:aceton=98:2, Rf=0.18) to yield 350 mg (65%) of an orange oil. 1H NMR (400 MHz, CDCl3) δ 0.93 (t, J=7.5 Hz, 3H), 1.16 (br t, J=7 Hz, 3H), 1.41-1.66 (m, 2H), 3.01-3.16 (m, 1H), 3.39-3.55 (m, 2H), 3.59-3.74 (m, 1H), 3.95-4.15 (m, 1H), 6.94 (br s, 1H), 6.95 (br s, 1H), 7.68 (dd, J=9 and 7 Hz, 1H), 8.15 (br d, J=9 Hz, 1H), 8.31 (br d, J=7 Hz, 1H).

出典