Nicotinic Acid → Tert-butyl 2-(nicotinamido)ethylcarbamate

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%).

1. dissolutionhad dissolved
2. custom(1 h)
3. customThe resulting reaction mixture
4. temperaturewas warmed to room temperature
5. stirringstirred for 2 h
6. washIt was then washed with brine
7. dry with materialdried over Na2SO4
8. filtrationfiltered
9. concentrationconcentrated under reduced pressure
10. customPurification by silica gel chromatography (CH2Cl2)

ORD-Eintrag

ord-673eac003ba94bcb9b77b863510ceb5f

Quelldatensatz

uspto-grants-2015_01

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08940903B2