(Diethylamino)sulfur trifluoride → (S)-methyl 6-(2-(1-(tert-butoxycarbonyl)-3-fluoro azetidin-3-yl)thiazol-4-yl)-5-cyclobutoxy-2-methyl-3,4-dihydroquinoline-1(2H)-carboxylate

Participants

Reaction Conditions

Reaction Steps

(Diethylamino)sulfur trifluoride (DAST) (0.152 g, 0.94 mmol) was added to a −78° C. solution of (S)-methyl 6-(2-(1-(tert-butoxycarbonyl)-3-hydroxyazetidin-3-yl)thiazol-4-yl)-5-cyclobutoxy-2-methyl-3,4-dihydroquinoline-1(2H)-carboxylate (0.100 g, 0.19 mmol) in dichloromethane (4 mL), and the resulting solution stirred for 2 h at −78° C. The reaction mixture was poured into saturated aqueous sodium bicarbonate solution (20 mL) and extracted with dichloromethane (3×20 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The residue was purified via preparative thin layer chromatography (eluting with 30% ethyl acetate/petroleum ether) to afford (S)-methyl 6-(2-(1-(tert-butoxycarbonyl)-3-fluoro azetidin-3-yl)thiazol-4-yl)-5-cyclobutoxy-2-methyl-3,4-dihydroquinoline-1(2H)-carboxylate (0.059 g, 59%) as a yellow solid. MS (ESI, pos. ion) m/z 532 [M+H]+.

Provenance & Evidence