[EN] PROCESS FOR PREPARATION OF MK-7 TYPE OF VITAMIN K2<br/>[FR] PROCÉDÉ DE PRÉPARATION DE LA VITAMINE K2 DE TYPE MK -7
申请人:INST FARMACEUTYCZNY
公开号:WO2014058330A2
公开(公告)日:2014-04-17
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 R1 represents C1-3-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 -SO2Ph 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.