تفاعل #1775

معادلة التفاعل

HCl

ethyl 2-methylnicotinate

diisobutylaluminum hydride

NaOH

→

3-Hydroxymethyl-2-methylpyridine

المذيبات

toluene

THF

ظروف التفاعل

المعالجة

1. 1
   درجة الحرارةwarmed to ambient temperature
2. 2
   workup.WAITAfter 1 h
3. 3
   درجة الحرارةthe solution was cooled in an ice bath
4. 4
   أخرىto quench
5. 5
   أخرىthe reaction
6. 6
   ترشيحfiltered
7. 7
   تركيزthe solvents were concentrated under reduced pressure
8. 8
   أخرىThe resulting aqueous solution was partitioned between CHCl3 and saturated aqueous NaHCO3
9. 9
   أخرىThe organic layer was separated
10. 10
    غسيلthe aqueous layer was washed with additional CHCl3 (5×40 mL)
11. 11
    تجفيفdried (MgSO4)
12. 12
    أخرىevaporated under reduced pressure

الإجراء التجريبي

To a stirred solution of ethyl 2-methylnicotinate (1.50 g, 9.09 mmol) in freshly distilled THF (100 mL) at 0° C. was added diisobutylaluminum hydride (11.2 mL of a 1.5M solution in toluene, 16.9 mmol). The solution was stirred for 6 h at 0° C. and then warmed to ambient temperature. After 1 h, the solution was cooled in an ice bath and 1N HCl (75 mL) was added to quench the reaction. The mixture was made alkaline with aqueous NaOH (pH=8.5), filtered, and the solvents were concentrated under reduced pressure. The resulting aqueous solution was partitioned between CHCl3 and saturated aqueous NaHCO3. The organic layer was separated, and the aqueous layer was washed with additional CHCl3 (5×40 mL). The organic layers were combined, dried (MgSO4), and evaporated under reduced pressure. 3-Hydroxymethyl-2-methylpyridine was obtained as a slightly amber oil and was used in the next step without purification (TLC: Rf =0.40 (5% MeOH:CH2Cl2)).

المصدر