申请人:Loyola University of Chicago
公开号:US05231232A1
公开(公告)日:1993-07-27
Methods of forming unsaturated C-18 ketones which can be used in the synthesis of Vitamins E and K.sub.1 are disclosed. One procedure involves coupling a C-9 primary allylic halide to a carbonyl-group-containing C-9 terminal alkyne. A second, two-step procedure employs a C-4 bis allylic halide (molar excess) and a carbonyl-group-containing C-9 terminal alkyne to form a C-13 primary allylic halide. The C-13 primary allylic halide can then be converted to the desired C-18 ketone by reaction with 2-methyl-3-butyn-2-ol. Novel C-18 ketones (e.g., 14-hydroxy-6,14-dimethyl-10-methylene-5-pentadecen-7,12-diyn-2-one), C-13 allylic halides (e.g., 10-chloromethyl-6-methyl-5,10-undecadien-7-yn-2-one) and C-9 allylic halides (e.g., 6-chloromethyl-2-methyl-6-hepten-3-yn-2-ol) are formed in the process.
形成不饱和C-18酮的方法已被披露,可用于合成维生素E和K.sub.1。其中一种方法涉及将C-9初级烯丙卤化物与含羰基的C-9末端炔烃偶联。第二种两步法使用C-4双烯丙卤化物(摩尔过量)和含羰基的C-9末端炔烃形成C-13初级烯丙卤化物。然后,C-13初级烯丙卤化物可以通过与2-甲基-3-丁炔-2-醇反应转化为所需的C-18酮。在这个过程中形成了新颖的C-18酮(例如,14-羟基-6,14-二甲基-10-亚甲基-5-十五烯-7,12-二炔-2-酮)、C-13烯丙卤化物(例如,10-氯甲基-6-甲基-5,10-十一烯-7-炔-2-酮)和C-9烯丙卤化物(例如,6-氯甲基-2-甲基-6-庚烯-3-炔-2-醇)。