Reaktion #92963

Reaktionsgleichung

2,2-dimethylpropanal

3-carboxymethylrhodanine

hydrochloric acid

K2CO3

→

3-carboxymethyl-5-(2,2-dimethylpropylidene)rhodanine

Ausbeute 62.7%

Lösungsmittel

water

DMF

Reaktionsbedingungen

Aufarbeitung

1. 1
   Extraktionextracted with ethyl acetate
2. 2
   SonstigeThe extract was purified through a silica gel column
3. 3
   Sonstigerecrystallized from a mixed solvent of ethyl acetate and ethanol

Vorschrift

Into 20 ml of dry DMF was dissolved 1.5 g (0.008 mole) of 3-carboxymethylrhodanine. To the solution was added 2.2 g (0.016 mole) of K2CO3 at a room temperature, and further 1 g (0.012 mole) of 2,2-dimethylpropanal was added dropwise at 60° C. After agitating at 60° C. for 30 minutes, the reaction mixture was poured into water. The resultant was adjusted to pH 4 with a dilute hydrochloric acid and then extracted with ethyl acetate. The extract was purified through a silica gel column and recrystallized from a mixed solvent of ethyl acetate and ethanol to give 1.3 g of 3-carboxymethyl-5-(2,2-dimethylpropylidene)rhodanine in the form of light yellow needle (yield: 63%).

Quelle