反应详情

A mixture of glycine (2.25 g, 0.03 mole), potassium-t-butoxide (2.81 g, 0.025 mole), and ethanol (700 mL) is stirred at room temperature for 15 minutes. 5-[(3,5-Bis(1,1-dimethylethyl)-4-hydroxyphenyl)methylene]-2-(methylthio)-4(5H)-thiazolone (7.27 g, 0.02 mole) is added to it and the mixture is refluxed with stirring for 20 hours. The mixture is then filtered and the solvent removed at 40° C. under reduced pressure. The residue is treated with ice-water, acidified with 1N aqueous hydrochloric acid and extracted with ether. The organic layer is washed with water, dried, and the solvent removed to give 7.75 g of a solid. The crude solid is recrystallized from tetrahydrofuran-ether to give 2.95 g (38%) of pure N-[5-[3,5-[bis(1,1-dimethylethyl)-4-hydroxyphenyl]methylene]-4-oxo-2-thiazolidinylidene]glycine, (Z)-, mp 260° C. (dec). Anal. for C20H26N2O4S.0.25C4H8O: Calcd: C, 61.74; H, 6.91; N, 6.86; S, 7.85. Found: C, 61.82; H, 7.08; N, 6.50; S, 7.55.

1. temperaturethe mixture is refluxed
2. stirringwith stirring for 20 hours
3. filtrationThe mixture is then filtered
4. customthe solvent removed at 40° C. under reduced pressure
5. additionThe residue is treated with ice-water
6. extractionextracted with ether
7. washThe organic layer is washed with water
8. customdried
9. customthe solvent removed