반응 #217877

반응 방정식

6-chloronicotinamide

potassium tert-butoxide

[2-(4-hydroxy-phenyl)-ethyl]-carbamic acid tert-butyl ester

tetrahydrofuran

→

{2-[4-(5-carbamoyl-pyridin-2-yloxy)-phenyl]-ethyl}-carbamic acid tert-butyl ester

수율 46.2%

용매

brine

반응 조건

후처리

1. 1
   온도to reflux for 18 h under nitrogen
2. 2
   온도Cool to room temperature
3. 3
   추출extract with diethyl ether (3×150 mL)
4. 4
   건조Dry the diethyl ether
5. 5
   여과filter
6. 6
   농축concentrate on a rotary evaporator
7. 7
   기타to give the crude product
8. 8
   기타The crude product is purified by flash chromatography on silica gel eluting with 0.7% concentrated ammonium hydroxide/7% ethanol/chloroform

실험 절차

Add potassium tert-butoxide (4.28 g, 36.2 mmol) to a stirred solution of [2-(4-hydroxy-phenyl)-ethyl]-carbamic acid tert-butyl ester (6.40 g, 27.0 mmol) and anhydrous tetrahydrofuran (120 mL). Stir for 30 minutes under nitrogen at room temperature. Add 6-chloronicotinamide (4.27 g, 27.2 mmol) and heat to reflux for 18 h under nitrogen. Cool to room temperature, pour the reaction mixture into, brine (150 mL), and extract with diethyl ether (3×150 mL). Dry the diethyl ether extracts over magnesium sulfate, filter, and concentrate on a rotary evaporator to give the crude product. The crude product is purified by flash chromatography on silica gel eluting with 0.7% concentrated ammonium hydroxide/7% ethanol/chloroform to yield 4.46 g (46%) of {2-[4-(5-carbamoyl-pyridin-2-yloxy)-phenyl]-ethyl}-carbamic acid tert-butyl ester: mass spectrum (ion spray): m/z=358.1 (M+1); 1H NMR (DMSO-d6): 8.58 (d, 1H), 8.22 (dd, 1H), 8.02 (br s, 1H), 7.46 (br s, 1H), 7.23 (d, 2H), 7.06-7.02 (m, 3H), 6.92-6.89 (m, 1H), 3.17-3.12 (m, 2H), 2.69 (t, 2H), 1.35 (s, 9H).

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