Dimethylformamide → 3-methyl-2-methylsulfanyl-6-pyridin-4-yl-3H-pyrimidin-4-one

Temperature

0 °C

A 2-liter 3-neck round bottom flask equipped with a nitrogen line, mechanical stirrer, and a wet ice bath was stirred a solution of ethyl acetate (58 mL, 600 mmol) and 4-cyanopyridine (62.4 g, 600 mmol) in 600 mL dry dimethylformamide at 0° C. Solid potassium bis(trimethylsilyl)amide (95%, 78.9 g, 660 mmol) added over a course of 5 min via a powder addition funnel. The dark red solution was stirred for 60 min at 0° C. Methylthioisocyanate (43.8 g, 600 mmol) in 20 mL dry dimethylformamide was added to the reaction. After 10 min a precipitate appeared. The reaction was mechanically stirred at 0° C. for 90 min. Iodomethane (37.6 mL, 600 mL) was added over a 2 min period. The precipitate dissolved during the addition followed by a new heavy precipitate. The mechanical stirrer was removed and the flask was swirled by hand. The solid was collected by filtration then washed with water, 100 mL cold ethanol, and 100 mL diethylether. The product was air dried for 3 days. M+1=234. NMR (CDCl3) s (3H; 2.7 ppm), s (3H; 3.6 ppm), s (1H; 6.7 ppm), d (2H; 7.8 ppm), d (2H; 8.7 ppm).

1. customA 2-liter 3-neck round bottom flask equipped with a nitrogen line, mechanical stirrer, and a wet ice bath
2. waitAfter 10 min a precipitate appeared
3. stirringThe reaction was mechanically stirred at 0° C. for 90 min
4. dissolutionThe precipitate dissolved during the addition
5. customThe mechanical stirrer was removed
6. filtrationThe solid was collected by filtration
7. washthen washed with water, 100 mL cold ethanol, and 100 mL diethylether
8. customdried for 3 days

ORD record

ord-fdd3502c60564e568b712fcaf856127c

Source dataset

uspto-grants-2006_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07049318B2