反应详情

0.70 g (1 mol equiv.) 4,N-Diethyl-4,5-dihydro-pyrazole-1-carboximidothioic acid methyl ester and 0.68 g (1.05 mol equiv.) trans-2-phenyl-ethenesulfonic acid amide were added to 7 mL acetonitrile, and the reaction mixture was refluxed overnight. Volatiles were removed under reduced pressure, and the residue was taken up in ethyl acetate and extracted with 2N NaOH. The organic layer was dried over Na2SO4, filtered and evaporated to dryness. Purification by flash chromatography on silica gel (Et2O:PA=2:1) afforded 1.00 g (81%) trans-2-phenyl-ethenesulfonic acid ethylamino-(4-ethyl-4,5-dihydro-pyrazol-1-yl)-methyleneamide. 1H NMR (400 MHz, CDCl3) δ 0.98 (t, J=7.5 Hz, 3H), 1.21 (t, J=7.2 Hz, 3H), 1.46-1.70 (m, 2H), 3.06-3.16 (m, 1H), 3.51-3.59 (m, 2H), 3.74 (dd, J=11.3, 7.5 Hz, 1H), 4.13 (t, J=11.3 Hz, 1H), 6.70-6.92 (m, 1H), 6.92 (d, J=1.3 Hz, 1H), 6.97 (d, J=15.4 Hz, 1H), 7.35-7.41 (m, 3H), 7.44 (d, J=15.4 Hz, 1H), 7.46-7.50 (m, 2H).

1. temperaturethe reaction mixture was refluxed overnight
2. customVolatiles were removed under reduced pressure
3. extractionextracted with 2N NaOH
4. dry with materialThe organic layer was dried over Na2SO4
5. filtrationfiltered
6. customevaporated to dryness
7. customPurification by flash chromatography on silica gel (Et2O:PA=2:1)