Cyclohexanol → (2,2-Dimethoxyethoxy)cyclohexane

Temperature

5 °C

Cyclohexanol (11.00 g) was added slowly over 2 hours to a stirred suspension of sodium hydride (4.80 g, 50% w/w dispersion in oil) in dry DMPU (100 ml) at 50° C. under argon. The mixture was stirred for an additional 30 minutes, then cooled to 5° C. and treated with 2-bromo-1,1-dimethoxyethane (16.9 g). Stirring was continued for 18 hours at ambient temperature. The mixture was then poured into ice-water (250 ml). The aqueous mixture was extracted with ether (4×100 ml). The combined extracts were washed successively with water (3×100 ml) and saturated brine (100 ml), then dried (MgSO4) and evaporated. Flash chromatography of the residue, eluting successively with hexane, 5% v/v ethyl acetate hexane and 10% v/v ethyl acetate/hexane, gave 2-cyclohexyloxy-1,1-dimethoxyethane as an oil (A) (7.32 g). This was used without further purification. [A sample was distilled under vacuum (bulb to bulb transfer); NMR: 1.29 (5H,m), 1.55 (1H,m), 1.76 (2H,m), 1.92 (2H,m), 3.27 (1H,m), 3.40 (6H,s), 3.50 (2H,d J=5 Hz), 4.48 (1H,t J=5 Hz).]

1. stirringStirring
2. waitwas continued for 18 hours at ambient temperature
3. extractionThe aqueous mixture was extracted with ether (4×100 ml)
4. washThe combined extracts were washed successively with water (3×100 ml) and saturated brine (100 ml)
5. dry with materialdried (MgSO4)
6. customevaporated
7. washFlash chromatography of the residue, eluting successively with hexane, 5% v/v ethyl acetate hexane and 10% v/v ethyl acetate/hexane

ORD record

ord-044ce2cc2883421696c914e3037b1820

Source dataset

uspto-grants-1990_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04921979