Using a combination of Kumada, Suzuki and Biellmann chemistry, various menaquinones can synthesized rapidly and with stereochemical integrity offering a new way of preparing these vitamin K2 components for the pharmaceutical market. In one embodiment a process for the preparation of a compound of formula (I) is defined including a step in which (i) a compound of formula (II) is reacted formula (III) wherein R is an alkyl group; LG is a leaving group; m is an integer from 0 to 8; n is an integer from 0 to 9; and X is hydrogen, halide, hydroxyl or protected hydroxyl; in the presence of a copper, nickel or palladium catalyst.
使用 Kumada、Suzuki 和 Biellmann
化学反应的组合,可以快速合成各种
维生素K2成分,保持立体
化学完整性,为制备这些成分提供了一种新的方法,以供制药市场使用。在一种实施例中,定义了一种制备化合物(I)的过程,其中包括以下步骤:(i) 在
铜、
镍或
钯催化剂的存在下,将化合物(II)与化合物(III)反应,其中R是烷基;LG是离去基团;m是0到8的整数;n是0到9的整数;X是氢、卤素、羟基或受保护的羟基。