Ammonium Chloride → HCID 15289535, compound

Participants

Reaction Steps

A suspension of 10.78 g of phenylmagnesium bromide in 65 cm3 of diethyl ether is added dropwise to a solution of 11.66 g of (3aS,7aS)-7,7-diphenyl-2-tert-butoxycarbonyl-perhydroisoindol-4-one in 70 cm3 of dry tetrahydrofuran at room temperature, while stirring. The reaction mixture is stirred at room temperature for 24 hours, refluxed for 5 hours and then treated with 250 cm3 of an aqueous saturated solution of ammonium chloride, diluted with 200 cm3 of ethyl acetate, washed with 200 cm3 of water (twice) and then with 200 cm3 of an aqueous saturated solution of sodium chloride, dried over magnesium sulphate, filtered and concentrated to dryness under reduced pressure (2.7 kPa). The residue is chromatographed over a Merck silica gel column (particle size 0.04-0.06 mm, diameter 5.3 cm, height 31.5 cm), by eluting under a pressure of 0.5 bar of nitrogen with a mixture of cyclohexane and ethyl acetate (90/10 by volume) and collecting fractions of 100 cm3. Fractions 23 to 48 are combined and concentrated to dryness under reduced pressure (2.7 kPa). 5.75 g of (3aS,4S,7aS)-4,7,7-triphenyl-2-tert-butoxycarbonyl-perhydroisoindol-4-ol are obtained in the form of a pale yellow foam.

Provenance & Evidence