تفاعل #88512

معادلة التفاعل

5-bromo-2-chloro-3-fluoropyridine

tert-butyl carbamate

cesium carbonate

→

title compound

المردود 86.0%

(6-Chloro-5-fluoropyridin-3-yl)-carbamic acid tert-butyl ester

المردود 86.0%

المذيبات

dioxane

ظروف التفاعل

المعالجة

1. 1
   درجة الحرارةThe reaction mixture was cooled to ambient temperature
2. 2
   أخرىthe resultant solid was removed by filtration
3. 3
   غسيلThe resultant solid was washed with ethyl acetate
4. 4
   تركيزconcentrated in-vacuo
5. 5
   أخرىto afford a residue that
6. 6
   أخرىwas purified by flash chromatography (silica: cyclohexane to 25% ethyl acetate/cyclohexane)

الإجراء التجريبي

A degassed mixture of 5-bromo-2-chloro-3-fluoropyridine (22.5 g, 107 mmol), tert-butyl carbamate (13.8 g, 117.5 mmol), tris(dibenzylideneacetone) dipalladium(0) (2.95 g, 3.2 mmol), XantPhos (2.48 g, 4.28 mmol) and cesium carbonate (69.7 g, 214 mmol) in dioxane (340 mL) was heated at 85° C. for 24 hours. The reaction mixture was cooled to ambient temperature and the resultant solid was removed by filtration. The resultant solid was washed with ethyl acetate followed by dichloromethane and the filtrate was combined and concentrated in-vacuo to afford a residue that was purified by flash chromatography (silica: cyclohexane to 25% ethyl acetate/cyclohexane) to afford the title compound as a pale yellow solid (22.6 g, 86%). 1H NMR (300 MHz, CDCl3): 8.04 (dd, J=10.1, 2.4 Hz, 1H), 7.98 (d, J=2.4 Hz, 1H), 6.62 (s, 1H), 1.53 (s, 9H).

المصدر