Sodium Carbonate → Ethyl 6-(benzo[d]thiazol-6-ylamino)-4-(isopropylamino)nicotinate

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To a solution of ethyl 6-chloro-4-(isopropylamino)nicotinate (2) (5 g, 20.66 mmol) in dioxane (30 mL):H2O (5 mL), 6-amino benzothiazole (20.66 mmol, 1 equiv.), xanthphos (8.2 mmol, 0.4 equiv.) and Na2CO3 (82.6 mmol, 4 equiv.) were added and degassed for 10 min. To the reaction mixture Pd2(dba)3 (8.2 mmol, 0.4 equiv.) was added and degassed again for 10 min. It was then heated at 115° C., overnight. The reaction was cooled and filtered through small pad of celite. The filtrate obtained was concentrated to provide crude material. The crude material was purified by column chromatography through silica gel and EtOAC:pet. Ether as eluent to afford ethyl 6-(benzo[d]thiazol-6-ylamino)-4-(isopropylamino)nicotinate (3). LC/MS: Acquity BEH C18 2.1×50 mm, 1.8 micron; Solvent A=0.1% TFA in water; Solvent B=0.1% TFA in ACN; gradient 0-100% B over 2 min; retention time: 0.78 min; LCMS (ES-API), m/z 357.8 (M+H).

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