Method for the photochemical conversion of tachysterol compounds into previtamin D compounds and of trans-vitamin D compounds into cis-vitamin D compounds
申请人:DUPHAR INTERNATIONAL RESEARCH B.V
公开号:EP0373687A1
公开(公告)日:1990-06-20
The invention relates to a method for the photochemical conversion of tachysterol compounds into previtamin D compounds and of trans-vitamin D compounds into cis-vitamin D compounds under the influence of radiation, by exposing the tachysterol compound and trans-vitamin D compound, respectively, dissolved in a suitable solvent system, in the presence of a polymeric photosensitizer consisting of a polymer chain ("backbone") comprising covalently bound sensitizers suitable for the photochemical conversion, to light with a wavelength of preferably between approx. 300 and approx. 1,000 nm, and by then isolating the resulting previtamin D compound and cis-vitamin D compound, respectively, in which a polymeric photosensitizer is used, the polymer chain of which has been selected from the group consisting of a polyether chain, an amino groups-containing polymer chain and a block copolymer chain comprising polyether segments and/or amino groups-containing polymer segments, in such a manner that the polymeric photosensitizer dissolves in the solvent system during the exposure to radiation but either upon cooling precipitates from the solution and can be separated, or, in case said polymer chain comprises amino groups, can be protonated with a suitable acid substance and be removed in an after-treatment. The invention also relates to a polymeric photosensitizer to be used for the said method.
本发明涉及一种在辐射影响下将速效甾醇化合物光化学转化为前维生素 D 化合物和将反式维生素 D 化合物光化学转化为顺式维生素 D 化合物的方法,该方法是将分别溶解在合适溶剂体系中的速效甾醇化合物和反式维生素 D 化合物,在由聚合物链("骨架")组成的聚合物光敏剂(其中包含适合光化学转化的共价结合敏化剂)的存在下,暴露于波长最好在约 300 到约 300 之间的光下。300 至约然后分别分离得到的前维生素 D 化合物和顺式维生素 D 化合物,其中使用的聚合物光敏剂的聚合物链选自聚醚链、含氨基聚合物链和由聚醚段和/或含氨基聚合物段组成的嵌段共聚物链组成的组、使聚合物光敏剂在辐照期间溶解在溶剂体系中,但冷却后从溶液中析出并可分离,或者,在所述聚合物链包含氨基的情况下,可与适当的酸性物质质子化,并在后处理中去除。本发明还涉及一种可用于上述方法的聚合物光敏剂。