Process for preparation of MK-7 type of vitamin K2 is characterized by attaching hexaprenyl chain of “all-trans” configuration to monoprenyl derivative of menadiol following “1+6” synthetic strategy. According to the invention, a-sulfonyl carbanion generated in situ from the protected monoprenyl menadiol of the formula (II), wherein R
1
represents C
1-3
-alkyl group, is reacted with hexaprenyl halide of the formula (VII), wherein X represents halogen atom, preferably bromine, both Z′ and Z′ represent H or one of Z′ and Z″ represents H and the other represents phenylsulfonyl group —SO
2
Ph in the alkylation reaction. The hexaprenyl halide of formula (VII) is obtained by coupling two triprenyl units in alkylation reaction, with or without separation of the intermediates.
MK-7型
维生素K2的制备过程的特征在于将“全反式”构型的六
异戊二烯基链附加到单
异戊二烯基衍
生物的甲
萘醇上,遵循“1+6”合成策略。根据本发明,从保护的式(II)单
异戊二烯基甲
萘醇中原位生成α-磺酰基碳负离子,其中R1表示C1-3烷基,与式(VII)的六
异戊二烯基卤化物反应,其中X表示卤素原子,优选
溴,Z'和Z''均表示H,或Z'和Z''中的一个表示H,另一个表示苯基磺酰基—SO2Ph在烷基化反应中。式(VII)的六
异戊二烯基卤化物是通过在烷基化反应中耦合两个三
异戊二烯基单元而获得的,中间体是否分离均可。