반응 #1563922

반응 방정식

cyclohexanol

NaHMDS

2-bromo-1,1-dimethoxyethane

→

title compound

수율 31.0%

(2,2-dimethoxyethoxy)cyclohexane

수율 31.0%

용매

DMF

EtOAc

반응 조건

후처리

1. 1
   세척wash with saturated aqueous NaCl (2×250 mL)
2. 2
   건조Dry the organic phase over MgSO4
3. 3
   여과filter
4. 4
   농축concentrate the filtrate under reduced pressure
5. 5
   세척eluting with a gradient of 0% to 10% EtOAc/hexanes
6. 6
   농축Concentrate the fractions
7. 7
   workup.ADDITIONcontaining the desired product under reduced pressure

실험 절차

Dissolve cyclohexanol (2.00 mL, 19.1 mmol) in DMF (9.6 mL), then add NaHMDS (1 M solution in THF, 21.0 mL, 21.0 mmol), and stir the solution at room temperature for 5 min. Add 2-bromo-1,1-dimethoxyethane (2.26 mL, 19.1 mmol), then stir the mixture at room temperature under a nitrogen atmosphere for three days. Dilute the mixture with EtOAc (250 mL) and wash with saturated aqueous NaCl (2×250 mL). Dry the organic phase over MgSO4, filter, and concentrate the filtrate under reduced pressure. Subject the resulting crude material to silica gel chromatography eluting with a gradient of 0% to 10% EtOAc/hexanes. Concentrate the fractions containing the desired product under reduced pressure to furnish the title compound as a pale yellow oil (1.10 g, 31% yield). 1H NMR (400 MHz, CDCl3): δ 4.47 (t, J=5.3 Hz, 1H), 3.49 (d, J=5.3 Hz, 2H), 3.39 (s, 6H), 3.25 (tt, J=9.2, 3.7 Hz, 1H), 1.94-1.87 (m, 2H), 1.76-1.69 (m, 2H), 1.55-1.49 (m, 1H), 1.34-1.17 (m, 5H).

출처