A new process prepares retiferol derivatives of formula I: 
wherein
A is —C≡C— or —CH═CH—, and
R1 and R2 are independently of each other lower alkyl or lower perfluoroalkyl,
one version couples ketones of formula II with compounds of formula III. A second version couples phosphinoxides of formula IV with aldehydes of formula V. Compounds of formula I are useful in the treatment or prevention of hyperproliferative skin diseases and for reversing the conditions associated with photodamage.
                            一种新的工艺制备了公式I的
视黄醇衍
生物:其中A为—C≡C—或—CH═CH—,而R1和R2是独立的低烷基或低
全氟烷基。其中一种版本将公式II的酮与公式III的化合物耦合。第二种版本将公式IV的膦氧化物与公式V的醛耦合。公式I的化合物用于治疗或预防过度增生性皮肤疾病,并用于逆转与光损伤相关的病症。