Menaquinone was prepared by catalytical hydrogenation, methoxy protection, bromization, Grignard reaction, and released protection by the reaction of oxidation. At last, vitamin K_(2(20)) been synthesized.

• 本文以2-甲基萘醌、香叶醇以及乙酸香叶酯为起始原料,经过催化加氢、甲氧基保护、溴代、格氏反应以及氧化脱保护等反应,最终合成了维生素K_(2(20))。