Ammonium Chloride → 1,4a,5,7a-Tetrahydrocyclopenta [c] pyrane-4-carboxylic acid methylester

Participants

Reaction Conditions

Reaction Steps

1.55 g of (1S,4aS,7aR)-1-[1-(ethoxy) ethoxy]-7-formyl-1,4a,5,7a-tetrahydrocyclopenta [c] pyrane-4-carboxylic acid methylester were dissolved in anhydrous tetrahydrofuran, followed by dropping 20 ml of magnesium pentylbromide (0.3 M tetrahydrofuran solution) while stirring and cooling at −78° C., and then stirring for 4 hours at the same temperature. After addition of saturated aqueous ammonium chloride solution to the reaction mixture, it was extracted with ethyl acetate. After washing the organic phase with brine, it was dried over magnesium sulfate. After distilling off the solvent under reduced pressure, the residue was purified by silica gel chromatography to obtain a colorless oil from the hexane-ether eluate in the form of (1S,4aS,7aR)-1-[1-(ethoxy) ethoxy]-7-(2-hydroxy)-n-hexyl]-1,4a,5,7a-tetrahydrocyclopenta [c] pyrane-4-carboxylic acid methylester (1.46 g, yield: 76%). The physicochemical properties of this compound are described below.

Provenance & Evidence