2,4,6-Trimethylpyridine → HCID 10296090, compound

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Reaction Steps

To a solution of N-(4-chlorobenzyl)-6-(hydroxymethyl)-1-methyl-4-oxo-1,4-dihydro-3-cinnolinecarboxamide [Example 4] (0.062 g), DMAP (0.015 g) and collidine (0.030 mL) in 5 mL anhydrous DMF in a flame-dried flask is added methanesulfonyl chloride (0.015 mL) in one portion. The reaction is stirred at room temperature for 18 h. Morpholine (0.16 mL) is then added in one portion and the reaction is stirred at room temperature for 5 h. The reaction is poured into 50 mL water. The aqueous solution is extracted 3× with CH2Cl2, then 2× with EtOAc. The organics are combined, dried over Na2SO4, filtered and concentrated. The residue is dissolved in CH2Cl2 and adsorbed onto silica. Purification by Biotage Flash 40S (eluent CH2Cl2 (1L), 1% MeOH/CH2Cl2 (1L), 2% MeOH/CH2Cl2 (1L), 3.5% MeOH/CH2Cl2 (1L), 5% MeOH/CH2Cl2 (1L)) affords the desired product as a pale yellow solid (0.034 g, 46%). Physical characteristics are as follows: m.p. 190-192° C.; 1H NMR (300 MHz, DMSO-d6) δ8.17, 7.94, 7.40, 4.56, 4.26, 3.66, 3.58, 2.39; MS (ESI) m/z 427.0 (M+H)+; HRMS (FAB) calcd for C22H23ClN4O3+H1 427.1537, found 427.1544. An alternate synthesis route for Example 5 is as follows:

Provenance & Evidence