Benzyl chloroformate → Benzyl (5-bromopyridin-2-yl)carbamate
Reaktionsgleichung
[NH2:1][C:2]1[CH:7]=[CH:6][C:5]([Br:8])=[CH:4][N:3]=1.Cl[C:10]([O:12][CH2:13][C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1)=[O:11]>C(Cl)(Cl)Cl>[CH2:13]([O:12][C:10](=[O:11])[NH:1][C:2]1[CH:7]=[CH:6][C:5]([Br:8])=[CH:4][N:3]=1)[C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1Komponenten
4
Edukt 2
Produkt 1
Reagenzien, Katalysatoren, Lösungsmittel 1
Versuchsvorschrift
A solution of 2-amino-5-bromopyridine (6.92 g, 40 mmol) and 6.22 g (48 mmol) of diisoproplethylamine in 50 mL of chloroform was added dropwise to a solution of 8.19 g (48 mmol) of benzyl chloroformate in 20 mL of chloroform at about 0° C., with stirring. A voluminous white precipitate formed. After about 15 minutes, the mixture was filtered and the precipitate was washed three times with chloroform and dried to give 2.70 g of the title product, mp 184° C. (dec) (recrystallization solvent=2-propanol). 1H nmr (dimethylsulfoxide-d6): δ=10.48 (br s, 1 H), 8.37 (d, 1 H), 7.98 (d of d, 1 H), 7.81 (d, 1 H), 7.40 (m, 5 H), 5.17 (s, 2 H); ms (NH3Cl): m/z=307, 309 (MH+).