반응 #2487468

반응 방정식

tert-butyl[5-chloro-2-(2-hydroxy-3-methylpentyl)-4-methoxyphenyl]carbamate

trifluoroacetic acid

→

title compound

수율 95.9%

1-(2-Amino-4-chloro-5-methoxyphenyl)-3-methylpentan-2-ol

수율 95.9%

용매

dichloromethane

반응 조건

후처리

1. 1
   온도cooling
2. 2
   농축The reaction mixture was concentrated under reduced pressure
3. 3
   workup.ADDITIONTo the residue were added ethyl acetate and saturated aqueous sodium hydrogen carbonate solution
4. 4
   기타to separate the organic layer
5. 5
   세척The organic layer was washed with saturated brine
6. 6
   건조dried over anhydrous sodium sulfate
7. 7
   농축concentrated under reduced pressure
8. 8
   기타The residue was purified by silica gel column chromatography (eluting solvent: ethyl acetate-hexane)

실험 절차

To a solution of tert-butyl[5-chloro-2-(2-hydroxy-3-methylpentyl)-4-methoxyphenyl]carbamate (873 mg) in dichloromethane (12.2 mL) was added dropwise trifluoroacetic acid (3.76 mL) under ice-cooling, and this mixture was stirred for 9 hours. The reaction mixture was concentrated under reduced pressure. To the residue were added ethyl acetate and saturated aqueous sodium hydrogen carbonate solution to separate the organic layer. The organic layer was washed with saturated brine, dried over anhydrous sodium sulfate, and then concentrated under reduced pressure. The residue was purified by silica gel column chromatography (eluting solvent: ethyl acetate-hexane) to obtain the title compound (603 mg). 1H-NMR (CDCl3) δ ppm: 0.75-1.75 (9H, m), 2.45-2.85 (2H, m), 3.30-4.10 (6H, m), 6.60-6.80 (2H, m). ESI-MS (m/z): 258, 260 (M+H)+

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