Diisopropylethylamine → (S)-4-chloro-N-(5-chloro-2-(4-hydroxy-3,3-dimethylpiperidine-1-carbonyl)pyridine-3-yl)-3-(trifluoromethyl)benzenesulfonamide

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Reaction Steps

General synthesis of amides: A 10 mL scintillation vial was charged with the 5-chloro-3-(4-chloro-3-trifluoromethyl-benzenesulfonylamino)-pyridine-2-carboxylic acid (164 mg, 0.4 mmol), freshly prepared 3,3-dimethylpiperidin-4-ol (0.56 mmol) ((M+H+), 130.1), HATU (192 mg, 0.5 mmol), DIEA (260 mg, 2 mmol) and anhydrous DMF (1.5 mL). The resultant solution was heated to 70° C. and stirred for 2 h. After cooled to room temperature, the mixture was purified via preparative HPLC and dried (lyophilizer) to afford (S)-4-chloro-N-(5-chloro-2-(4-hydroxy-3,3-dimethylpiperidine-1-carbonyl)pyridine-3-yl)-3-(trifluoromethyl)benzenesulfonamide (1:2 mixture of rotamers): 1H NMR (400 MHz, CDCl3) (major rotamer) δ 9.54 (s, 1H), 8.26 (d, 1H), 8.12 (d, 1H), 8.00 (d, 1H), 7.88 (dd, 1H), 7.62 (d, 1H), 4.05 (m, 1H), 3.70 (d, 1H), 3.50 (m, 2H), 3.40 (m, 1H), 3.10 (d, 1H), 1.82 (m, 2H), 1.00 (s, 3H), 0.92 (s, 3H); MS (ES) (M+H)+ expected 526.0, found 526.0.

Provenance & Evidence