Methyl N-(triethylammoniosulfonyl)carbamate → Tert-butyl 1-(6-fluoro-4-(5-methyl-1,3,4-oxadiazol-2-yl)-3-(pyridin-2-yl)quinolin-2-yl)ethylcarbamate

Participants

Reaction Steps

A solution of tert-butyl 1-(4-(2-acetylhydrazinecarbonyl)-6-fluoro-3-(pyridin-2-yl)quinolin-2-yl)ethylcarbamate (0.553 g, 1.183 mmol) and Burgess reagent (1.128 g, 4.73 mmol) in dichloroethane (11.83 mL) was heated in the microwave at 120° C. for 1 h. The reaction mixture was diluted with water (50 mL) and extracted with DCM (2×50 mL). The organic extracts were washed with brine (1×50 mL), dried over Na2SO4, filtered, and concentrated in vacuo to give the crude product. The crude material was purified by silica gel column chromatography eluting with a gradient of 0% to 100% EtOAc in hexane, to provide tert-butyl 1-(6-fluoro-4-(5-methyl-1,3,4-oxadiazol-2-yl)-3-(pyridin-2-yl)quinolin-2-yl)ethylcarbamate as a pink solid: 1H NMR (400 MHz, DMSO-d6) δ ppm 8.61 (1H, d, J=4.3 Hz), 8.22-8.32 (1H, m), 7.80-7.92 (3H, m), 7.36-7.49 (2H, m), 7.17 (1H, d, J=7.0 Hz), 4.88 (1H, t, J=7.1 Hz), 2.34 (3H, s), 1.22-1.38 (12H, m); LC-MS (ESI) m/z 450.1 [M+H]+.

Provenance & Evidence