반응 #57114

반응 방정식

tert-butyl 4-(2-(1-hydroxycyclohexyl)-2-{3-[(trimethylsilyl)ethynyl]phenyl}ethyl)piperazine-1-carboxylate

potassium carbonate

→

tert-butyl 4-[2-(3-ethynylphenyl)-2-(1-hydroxycyclohexyl)ethyl]piperazine-1-carboxylate

수율 80.0%

용매

methanol

반응 조건

후처리

1. 1
   기타The reaction mixture was quenched with aqueous ammonium chloride (5 mL)
2. 2
   추출extracted with ethyl acetate
3. 3
   세척The organic layer was washed with water, brine
4. 4
   건조dried (sodium sulfate)
5. 5
   여과filtered
6. 6
   농축concentrated
7. 7
   기타to give a crude oil, which
8. 8
   기타was purified via silica gel flash chromatography (gradient from 10% ethyl acetate/hexane to 30% ethyl acetate/hexane)

실험 절차

To a solution of tert-butyl 4-(2-(1-hydroxycyclohexyl)-2-{3-[(trimethylsilyl)ethynyl]phenyl}ethyl)piperazine-1-carboxylate (104 mg, 0.215 mmol) in methanol (3 mL) was added potassium carbonate (300 mg, 2.17 mmol) and the mixture was stirred for 30 min at room temperature. The reaction mixture was quenched with aqueous ammonium chloride (5 mL) and extracted with ethyl acetate. The organic layer was washed with water, brine, dried (sodium sulfate), filtered and concentrated to give a crude oil, which was purified via silica gel flash chromatography (gradient from 10% ethyl acetate/hexane to 30% ethyl acetate/hexane) to yield 70 mg (80%) tert-butyl 4-[2-(3-ethynylphenyl)-2-(1-hydroxycyclohexyl)ethyl]piperazine-1-carboxylate as a white solid. MS (ESI) m/z 413 ([M+H]+); HRMS: calcd for C25H36N2O3+H, 413.2804; found (ESI, [M+H]+), 413.2809.

출처