A process for synthesizing aryltretinoin and aryltretinoin ethylester, used for preparing capsules to treat
psoriasis, includes such steps as reaction between [1-(5,6,7,,8-tetrahydro-5,5,8,8-tetramethyl-2-naphthyl)-ethyl]-
phosphine triphenylbromide and p-ethoxycarbonyl
benzaldehyde in isopropanol to obtain P-[(E)-2 -(5,6,7,8-tetrahydro-5,5,8,8-tetramethyl-2-naphthyl)
propenyl]-
ethyl benzoate, that is, aryltretinoin ethylester, and adding it to
alcohol to synthesize P-[(E)-2 -(5,6,7,8-tetrahydro-5,5,8,8-tetramethyl-2-naphthyl)
propenyl]-benzoate, that is, aryltretinoin.