2-Methylbenzenesulfonic acid → HCID 20041420, compound

Participants

Reaction Steps

A solution of 2.9 g (21 mmol) of (prop-2-ynyl)cyclohexanol in 10 ml of dry ether was stirred under argon as 0.24 ml (26 mmol) of dihydropyran was added followed by about 5 mg of toluenesulfonic acid. After one hour, tlc (CHCl3, silica gel) analysis indicated that significant starting material remained. Another 0.2 ml of dihydropyran and about 5 mg of toluenesulfonic acid were added. Twice more at one hour intervals, 0.2 ml portions of dihydropyran along with a small amount of toluenesulfonic acid were added to the reaction mixture. It was left to stir under argon at room temperature for 15 hours. Potassium carbonate was then added to the mixture and it was stirred for several minutes before it was washed with water. The wash solution was back extracted with ether and the combined extracts were then washed with brine, dried (Na2SO4) and evaporated in vacuo to yield 4.6 g of 1-(tetrahydropyran-2-yloxy)-1-(prop-2-ynyl)cyclohexane) having the following spectral characteristics: nmr (CDCl3) δ 1.0-2.5 (19H, m), 3.6 (2H, broad m) and 4.65 ppm (1H, broad s); ir (CHCl3) 980, 1030, 1050, 1070, 1120, 1150, 1270, 1450, 2120, (weak) 2760, 2930 and 3300 cm-1.

Provenance & Evidence