Nicotinamide → 6,11-dihydro-5H-dipyrido[2,3-b:4',3'-f]azepin-5-one

Temperature

-78 °C

N,N,N′,N′-tetramethylethylenediamine (8.0 mL, 0.053 mol) and N,N-diisopropylamine (7.4 mL, 0.053 mol) were mixed in tetrahydrofuran (43 mL) and then cooled to −78° C. To the mixture was added 2.50 M of n-butyllithium in hexane (21 mL, 0.0525 mol) and stirred at −78° C. for 10 minutes then at 0° C. for 10 minutes. In a separate flask was added N,N-diethyl-2-[4-methylpyridin-3-yl)amino]nicotinamide (5.00 g, 0.0176 mol) in tetrahydrofuran (100 mL) and then cooled to 0° C. under an atmosphere of nitrogen. The mixture from the first flask was added to the second flask and the resulting mixture stirred at 0° C. for 30 minutes. The reaction was quenched with (aq)NH4Cl and was extracted with ethyl acetate. The organic extracts were washed with brine, dried over MgSO4, concentrated, and purified by column chromatography on silica gel (10% methanol 90% ethyl acetate) to give 3.34 g of the desired product. 1H NMR (300 MHz, CDCl3): δ 8.49 (s, 1H), 8.41-8.45 (m, 2H), 8.34 (dd, 1H, J1=7.8 Hz, J2=1.5 Hz), 7.78 (br s, 1H), 7.24-7.26 (m, 1H), 6.97-7.25 (m, 1H), 3.89 (s, 2H). MS [M+H]=212.

1. waitat 0° C. for 10 minutes
2. temperaturecooled to 0° C. under an atmosphere of nitrogen
3. additionThe mixture from the first flask was added to the second flask
4. stirringthe resulting mixture stirred at 0° C. for 30 minutes
5. customThe reaction was quenched with (aq)NH4Cl
6. extractionwas extracted with ethyl acetate
7. washThe organic extracts were washed with brine
8. dry with materialdried over MgSO4
9. concentrationconcentrated
10. custompurified by column chromatography on silica gel (10% methanol 90% ethyl acetate)

ORD record

ord-4758748fcd1044878021ebeab4d81f6a

Source dataset

uspto-grants-2014_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08835423B2