تفاعل #1483034

معادلة التفاعل

tert-butyl 2-aminoethylcarbamate

Et3N

nicotinic acid

oxalyl chloride

→

tert-butyl 2-(nicotinamido)ethylcarbamate

المردود 74.0%

المذيبات

CH2Cl2

CH2Cl2

ظروف التفاعل

المعالجة

1. 1
   workup.DISSOLUTIONhad dissolved
2. 2
   أخرى(1 h)
3. 3
   أخرىThe resulting reaction mixture
4. 4
   درجة الحرارةwas warmed to room temperature
5. 5
   workup.STIRRINGstirred for 2 h
6. 6
   غسيلIt was then washed with brine
7. 7
   تجفيفdried over Na2SO4
8. 8
   ترشيحfiltered
9. 9
   تركيزconcentrated under reduced pressure
10. 10
    أخرىPurification by silica gel chromatography (CH2Cl2)

الإجراء التجريبي

In a typical run, nicotinic acid (2.0 g, 16.2 mmol) was taken up in CH2Cl2 (20 mL) along with oxalyl chloride (1.4 mL, 16.2 mmol). After a few drops of DMF were added, the reaction mixture was stirred at room temperature until all the solids had dissolved and all gas evolution had ceased (1 h). This freshly prepared solution of the acid chloride was added dropwise at 0° C. to a solution containing tert-butyl 2-aminoethylcarbamate (2.6 g, 16.2 mmol) and Et3N (3.4 mL, 24.2 mmol) in CH2Cl2 (200 mL). The resulting reaction mixture was warmed to room temperature and stirred for 2 h. It was then washed with brine, dried over Na2SO4, filtered and concentrated under reduced pressure. Purification by silica gel chromatography (CH2Cl2) afforded tert-butyl 2-(nicotinamido)ethylcarbamate (3.1 g, 74%).

المصدر