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.
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 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,而且具有立体化学完整性,为制药市场提供了制备这些维生素 K2 成分的新方法。在一个实施方案中,制备式(I)化合物的工艺是
定义包括一个步骤,其中 (i) 式 (II) 化合物与式 (III) 化合物反应
其中 R 是烷基
LG 是离去基团
m 是 0 至 8 的整数
n 是 0 至 9 的整数;以及
X 是氢、卤化物、羟基或受保护的羟基;
在铜、镍或钯催化剂存在下。
MARSHALL, J. A.;ANDREWS, R. C., J. ORG. CHEM., 1985, 50, N 10, 1602-1606