反应详情

1,1'-Thiocarbonyldiimidazole (0.64 g, 0.0036 mole) is added portionwise to a stirred 0° C. solution of 3,5-bis(1,1-dimethylethyl)-4-[(2-methoxyethoxy)methoxy]benzene carboximidic acid hydrazide (1.0 g, 0.0028 mole) and triethylamine (0.43 ml, 0.003 mole) in tetrahydrofuran (5.0 ml). After the addition is complete the mixture is heated to reflux for 1.5 hours. The solution is cooled and concentrated in vacuo. The residue is dissolved in ether (20 ml) and the solution washed with aqueous 2M HCl, saturated aqueous NaHCO3, saturated aqueous NaCl, and dried over MgSO4. Filtration and concentration in vacuo gives 0.94 g (1.1 g theor., 86%) product after recrystallization from ethyl acetate/isopropyl ether, mp 187° C.

1. additionAfter the addition
2. temperatureis heated
3. temperatureto reflux for 1.5 hours
4. temperatureThe solution is cooled
5. concentrationconcentrated in vacuo
6. dissolutionThe residue is dissolved in ether (20 ml)
7. washthe solution washed with aqueous 2M HCl, saturated aqueous NaHCO3, saturated aqueous NaCl
8. dry with materialdried over MgSO4
9. filtrationFiltration and concentration in vacuo
10. customgives 0.94 g (1.1 g theor., 86%) product
11. customafter recrystallization from ethyl acetate/isopropyl ether, mp 187° C.