تفاعل #58985

معادلة التفاعل

hydrochloric acid

4-(4-fluorophenyl)-1,2,3-thiadiazole-5-carbaldehyde

ethyl diethylphosphonoacetate

sodium hydride

→

(2E)-3-[4-(4-fluorophenyl)-1,2,3-thiadiazol-5-yl]acrylic acid

المردود 60.1%

المذيبات

N,N-dimethylformamide

ظروف التفاعل

المعالجة

1. 1
   استخلاصthe mixture was extracted with ethyl acetate
2. 2
   تركيزThe ethyl acetate layer was concentrated
3. 3
   workup.ADDITIONa 6N aqueous hydrochloric acid solution (3 ml) and acetic acid (3 ml) were added to the residue
4. 4
   workup.STIRRINGThe mixture was stirred for 3 hrs
5. 5
   درجة الحرارةwith heating
6. 6
   درجة الحرارةunder reflux
7. 7
   تركيزThe reaction mixture was concentrated
8. 8
   workup.ADDITIONpoured into water
9. 9
   ترشيحThe precipitated solids were collected by filtration
10. 10
    غسيلwashed with water
11. 11
    أخرىdried

الإجراء التجريبي

A mixture of 4-(4-fluorophenyl)-1,2,3-thiadiazole-5-carbaldehyde (180 mg), ethyl diethylphosphonoacetate (450 mg), sodium hydride (60% in oil, 40 mg) and N,N-dimethylformamide (3 ml) was stirred at room temperature for 2 hrs. The reaction mixture was poured into a 1N aqueous hydrochloric acid solution and the mixture was extracted with ethyl acetate. The ethyl acetate layer was concentrated, and a 6N aqueous hydrochloric acid solution (3 ml) and acetic acid (3 ml) were added to the residue. The mixture was stirred for 3 hrs. with heating under reflux. The reaction mixture was concentrated and poured into water. The precipitated solids were collected by filtration, washed with water and dried to give (2E)-3-[4-(4-fluorophenyl)-1,2,3-thiadiazol-5-yl]acrylic acid (130 mg, yield 60%) as a pale-yellow solid.

المصدر