تفاعل #1141

معادلة التفاعل

5-(2-Hydroxy-2-methyl-3-butynyl)-3-(1-methyl-5-pyrrolidin-2-onyl)pyridine

sodium hydride

toluene acetone

→

5-ethynyl-3-(1-methyl-5-pyrrolidin-2-onyl)pyridine

المردود 81.1%

المذيبات

toluene

ظروف التفاعل

المعالجة

1. 1
   أخرىwere removed by distillation
2. 2
   workup.ADDITIONwater (10 mL) and ethyl acetate (20 mL) were added
3. 3
   أخرىThe organic phase was separated
4. 4
   استخلاصthe aqueous layer extracted with ethyl acetate (2×20 mL)
5. 5
   غسيلthe combined organic extracts were washed with brine (10 mL)
6. 6
   تجفيفdried (MgSO4)
7. 7
   تركيزconcentrated in vacuo
8. 8
   أخرىThe crude product was purified by silica gel column chromatography with ethyl acetate as eluant

الإجراء التجريبي

5-(2-Hydroxy-2-methyl-3-butynyl)-3-(1-methyl-5-pyrrolidin-2-onyl)pyridine (200 mg, 0.77 mmol) was dissolved in toluene (20 mL) and catalytic sodium hydride (5 mg) was added. The solution was heated until several milliliters of toluene-acetone mixture were removed by distillation. The mixture was cooled to 25° C. and water (10 mL) and ethyl acetate (20 mL) were added. The organic phase was separated and the aqueous layer extracted with ethyl acetate (2×20 mL) and the combined organic extracts were washed with brine (10 mL), dried (MgSO4) and concentrated in vacuo. The crude product was purified by silica gel column chromatography with ethyl acetate as eluant to afford 5-ethynyl-3-(1-methyl-5-pyrrolidin-2-onyl)pyridine as a solid (125 mg, 81%). M.p. 83°-84° C.; 1H NMR (CDCl3, 300 MHz): δ 8.69 (d, J=2 Hz, 1H), 8.46 (d, J=2 Hz, 1H), 7.62 (t, J=2 Hz, 1H), 4.57 (dd, J=7, 6 Hz, 1H), 3.28 (s, 1H), 2.70 (s, 3H), 2.45-2.65 (m, 3H), 1.88 (m, 1H).

المصدر