反应详情

温度

95 °C

2-Amino-5-tert-butyl-1,3,4-thiadiazole (204 mg, 1.3 mmol) was suspended in pyridine (0.5 mL). p-Dodecylbenzenesulfonyl chloride (300 mg, 0.87 mmol) was added slowly at 0° C. The reaction mixture was then heated to 95° C. and was stirred at this temperature for 1 h. The reaction mixture was then added to aqueous 10% HCl (5 mL) and the resulting mixture extracted with ethyl acetate (3×10 mL). The organic extracts were washed with water, brine, dried over anhydrous Na2SO4, filtered, and volatiles evaporated to yield a solid mass. Chromatography on silica gel (70-230 mesh) eluted with 2% MeOH in CH2Cl2 gave the product (350 mg, 0.75 mmol, 87%). Recrystallization from hexanes:ethyl acetate (3:7) gave an analytical sample, mp 117-118° C.; 1H NMR (500 MHz, CDCl3) δ 0.88 (3, t, J=6.5 Hz), 1.20-1.36 (18, m), 1.38 (9, s), 1.56-1.64 (2, m), 2.63 (2, t, J=7.5 Hz), 7.25 (2, d, J=8.0 Hz), 7.86 (2, d, J=8.0 Hz), 12.24 (1, br s); 13C NMR (125 MHz, CDCl3) δ 14.1, 22.7, 29.2, 29.3, 29.4, 29.5, 29.6, 29.7, 31.1, 31.8, 35.8, 36.5, 126.5, 128.7, 138.5, 148.1, 167.8, 168.0; MS (ESI+, m/z) Calcd for C24H40N3O2S2 466.3. found 466.2 (M+H)+; HRMS (ESI+, m/z) Calcd for C24H40N3O2S2 466.2562. found 466.2562 (M+H)+.

1. extractionthe resulting mixture extracted with ethyl acetate (3×10 mL)
2. washThe organic extracts were washed with water, brine
3. dry with materialdried over anhydrous Na2SO4
4. filtrationfiltered
5. customvolatiles evaporated
6. customto yield a solid mass
7. washChromatography on silica gel (70-230 mesh) eluted with 2% MeOH in CH2Cl2