P-Toluenesulfonylhydrazide → 3-(2-(4-methoxybenzylamino)-6-bromoquinolin-3-yl)-N-(cyclohexylmethyl)propanamide

Participants

Reaction Conditions

Reaction Steps

To a stirred solution of (E)-3-(2-(4-methoxybenzylamino)-6-bromoquinolin-3-yl)-N-(cyclohexylmethyl)acrylamide (representative compound 10; 3.7 g, 7.3 mmol) in DME (100 mL) was added 4-methylbenzenesulfonohydrazide (13.6 g, 72.8 mmol). The mixture was brought to reflux at 86° C. and then via addition funnel was added dropwise a solution of sodium acetate (10.4 g, 127 mmol) in water (60 mL) over 1.5 h. Once the addition was complete, the reaction was refluxed for an additional 30 min, and then cooled to RT and concentrated to remove organic solvent. The crude material was dissolved in DCM (150 mL) and washed sequentially with 1N NaOH, 1N HCl, and then water. The organic layer was dried over MgSO4, filtered and concentrated to give a yellow oil. Purification via flash chromatography (5% EtOAc/dichloromethane) afforded 3-(2-(4-methoxybenzylamino)-6-bromoquinolin-3-yl)-N-(cyclohexylmethyl)propanamide (representative compound 11). Step 2 In a sealed tube was combined 3-(2-(4-methoxybenzylamino)-6-bromoquinolin-3-yl)-N-(cyclohexylmethyl)propanamide (0.16 g, 0.31 mmol), 2-chlorophenylboronic acid (0.074 g, 0.47 mmol), bis(di-tert-butyl(4-dimethylaminophenyl)phosphine)dichloropalladium(II) (0.0044 g, 0.0063 mmol), potassium acetate (0.062 g, 0.63 mmol), EtOH (6.0 ml) and water (0.41 mL). The flask was sealed and heated in an oil bath at 85° C. for 16 h. The reaction mixture was cooled to RT, adsorbed onto silica and purified by flash chromatography (5% MeOH/dichloromethane) to afford 3-(2-(4-methoxybenzylamino)-6-(2-chlorophenyl)quinolin-3-yl)-N-(cyclohexylmethyl)propanamide. Step: 3 Following the same procedure as in Step 9 of Scheme II, 3-(2-amino-6-(2-chlorophenyl)quinolin-3-yl)-N-(cyclohexylmethyl)propanamide (representative compound 6) was obtained after 3 hours of refluxing in TFA. MS (ESI, pos. ion) m/z: 422 (M+1).

Provenance & Evidence