反应详情

温度

65 °C

A mixture of 5-isothiocyanato-3-methylpicolinonitrile (Intermediate 6, 2.9 g, 16.57 mmol) and 4-((1-cyanocyclobutyl)amino)-2-fluoro-N-methylbenzamide (Intermediate 21, 2.7 g, 11.05 mmol) in DMA was heated to 65° C. overnight. MeOH (50 mL) and HCl (2M, 70 mL) were added and the mixture was heated to 105° C. for 1 h then cooled to room temperature. Water was slowly added until a yellow solid precipitated and the mixture was stirred at room temperature for 3 h. The solid was filtered, washed with water, dissolved in DCM, dried over sodium sulfate, and absorbed on silica gel. Purification by column chromatography on silica gel eluting with 0 to 100% EtOAc/hexanes afforded a pale yellow solid. This solid was triturated in MeOH, filtered, and dried to afford 1.39 g (29%) of 4-(7-(6-cyano-5-methylpyridin-3-yl)-8-oxo-6-thioxo-5,7-diazaspiro[3.4]octan-5-yl)-2-fluoro-N-methylbenzamide as a white solid. 1H NMR (300 MHz, DMSO-d6) δ 8.64 (d, 1H), 8.40 (m, 1H), 8.06 (d, 1H), 7.75 (t, 1H), 7.43 (dd, 1H), 7.32 (dd, 1H), 2.73 (d, 3H), 2.59-2.53 (m, 2H), 2.52 (s, 3H), 2.44-2.23 (m, 2H), 1.91-1.88 (m, 1H), 1.52-1.48 (m, 1H). LCMS [M+1]+ 424.0.

1. temperaturethe mixture was heated to 105° C. for 1 h
2. temperaturethen cooled to room temperature
3. customprecipitated
4. filtrationThe solid was filtered
5. washwashed with water
6. dissolutiondissolved in DCM
7. dry with materialdried over sodium sulfate
8. customabsorbed on silica gel
9. customPurification by column chromatography on silica gel eluting with 0 to 100% EtOAc/hexanes
10. customafforded a pale yellow solid
11. customThis solid was triturated in MeOH
12. filtrationfiltered
13. customdried