反应详情

A solution of α-mercapto-2'-chloro-4-biphenylylacetic acid 5.6 g. (0.02 moles) in 25 ml. of pyridine is cooled in an ice bath. To this is added dropwise 2.1 ml. (0.022 moles) of ethyl chloroformate. The mixture is basified with 10% sodium bicarbonate solution. The alkaline mixture is worked with ether, then acidified with 10% hydrochloric acid, washed with ether, dried and filtered. The solvent is removed and the residue is triturated with hexane to obtain α-ethoxycarbonylthio-2'-chloro-4-biphenylylacetic acid.

1. additionTo this is added dropwise 2.1 ml
2. washwashed with ether
3. customdried
4. filtrationfiltered
5. customThe solvent is removed
6. customthe residue is triturated with hexane