PROCESS FOR PREPARATION OF MK-7 TYPE OF VITAMIN K2
申请人:NATTOPHARMA R&D LTD
公开号:US20150291498A1
公开(公告)日:2015-10-15
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.