4-Chloro-6-methyl-1,3,5-triazin-2-amine → 4-(5-Chloro-2-fluoropyridin-3-yl)-6-methyl-1,3,5-triazin-2-amine

Participants

Reaction Conditions

Reaction Steps

To a 20 mL microwave reaction tube was added 4-chloro-6-methyl-1,3,5-triazin-2-amine (Example 9, 1.00 g, 6.94 mmol), 5-chloro-2-fluoropyridin-3-ylboronic acid (Combi-Blocks, 1.62 g, 9.22 mmol), potassium acetate (Aldrich, 2.07 g, 21.1 mmol) and Am-Phos (Aldrich, 0.247 g, 0.349 mmol) in EtOH (12 mL) and water (1.2 mL). The mixture was degassed by bubbling argon through for 5 min. The tube was heated in an microwave reactor (Biotage) at 100° C. for 20 min. The reaction mixture was partitioned between water (100 mL) and 25% IPA in chloroform with 1% NH4OH (60 mL). The aqueous phase was extracted with 25% IPA in chloroform with 1% NH4OH (2×50 mL). The combined organic phases were washed with saturated aqueous sodium chloride (40 mL). The organic phase was dried over sodium sulfate, filtered and concentrated in vacuo. Adding DCM to the residue resulted in precipitate formation. The solid was collected via filtration and washed with MeOH to afford 4-(5-chloro-2-fluoropyridin-3-yl)-6-methyl-1,3,5-triazin-2-amine (0.937 g) as a light yellow powder. The filtrate and the wash were combined and concentrated, then purified by column chromatography (eluent: iPrOH (w/10% NH4OH) in CHCl3 0.25% to 6.25%) followed by washing with MeOH to afford additional product (0.149 g) as a white solid. The total yield is 1.08 g (65%). 1H NMR (400 MHz, DMSO-d6) δ ppm 8.54 (dd, J=8.02, 2.74 Hz, 1H) 8.46-8.51 (m, 1H) 7.73 (s, 2H) 2.37 (s, 3H). m/z (ESI, positive ion) m/z: 240.1 (M+H)+.

Provenance & Evidence