Using a combination of Kumada, Suzuki and Biellmann chemistry, various menaquinones can synthesised 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 with a compound of 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 of from 0 to 9; and
X is hydrogen, halide, hydroxyl or protected hydroxyl;
in the presence of a copper, nickel or palladium catalyst.
利用 Kumada、Suzuki 和 Biellmann
化学的组合,可以快速合成各种 menaquinones,并保持立体
化学完整性,为制备这些
维生素 K2 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式(I)的过程,其中包括以下步骤:(i)将化合物式(II)与化合物式(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;在
铜、
镍或
钯催化剂的存在下进行。