反应详情

Ethyl 2-mercaptoacetate (8.5 cc) is added in the course of 15 minutes at a temperature in the region of 20° C. to a stirred solution, through which a stream of nitrogen is passed, of a 2M ethanolic solution of sodium ethylate (37.5 cc) and ethanol (50 cc). The mixture is left with stirring for 15 minutes at the same temperature, and α-bromo-p-xylene (13.9 g) is then added in the course of 20 minutes at a temperature in the region of 20° C. Stirring is maintained for 60 minutes at this temperature, and the reaction mixture is then evaporated to dryness at 50° C. under reduced pressure (20 mm Hg; 2.7 kPa). The residue obtained is dissolved in dichloromethane (100 cc), and the organic phase is dried over anhydrous magnesium sulphate, filtered and concentrated to dryness at 40° C. under reduced pressure (20 mm Hg; 2.7 kPa). Ethyl (4-methylbenzylthio)acetate (15.6 g) is thereby obtained, and is used in the crude state in the subsequent syntheses.

1. waitThe mixture is left
2. additionis then added in the course of 20 minutes at a temperature in the region of 20° C
3. temperatureis maintained for 60 minutes at this temperature
4. customthe reaction mixture is then evaporated to dryness at 50° C. under reduced pressure (20 mm Hg; 2.7 kPa)
5. customThe residue obtained
6. dry with materialthe organic phase is dried over anhydrous magnesium sulphate
7. filtrationfiltered
8. concentrationconcentrated to dryness at 40° C. under reduced pressure (20 mm Hg; 2.7 kPa)