p-Toluenesulfonic acid monohydrate → tetrahydro-3-hexyl-4-hydroxy-(R)-6-undecyl-2H-pyran-2-one

Participants

Reaction Steps

15.4 g of a diastereomer mixture of 2-hexyl-3-hydroxy-(R)-5 [(tetrahydro-2H -pyran-2-yl)oxy]hexadecanoic acid are dissolved in 160 ml of ethanol and 800 mg of toluene-4-sulphonic acid monohydrate are added. The reaction mixture is heated to 55°-60° C. until the reaction has finished. The solvent is removed in vacuo and the residue is dissolved in 160 ml of dichloromethane. The solution is stirred at room temperature for 1 hour. The reaction mixture is evaporated. The material obtained is chromatographed on silica gel. There is obtained tetrahydro-3-hexyl-4-hydroxy-(R)-6-undecyl-2H-pyran-2-one, m.p. 95°-96° C.

Provenance & Evidence