申请人:Trampota Miroslav
公开号:US20090093642A1
公开(公告)日:2009-04-09
This invention relates to a novel process for the preparation of optically pure L-(+)-ergothioneine. The process for the chemical synthesis of L-ergothioneine comprises steps which consist of reacting L-histidine alkyl ester with an acid halide, chloroformate or pyrocarbonate in the presence of a base, hydrolysis of the alkyl-(S,Z)-2,4,5-triamidopent-4-enoate to obtain a (S)-alkyl 2,5-diamido-4-oxopentanoate, acid catalyzed hydrolysis of the (S)-alkyl 2,5-diamido-4-oxopentanoate followed by reaction with a metal thiocyanate to obtain the thiohistidine, protection of the sulfur of thiohistidine as the tert-butyl thioether, dialkylation of the primary amine to obtain a tertiary amine, quaternization of the tertiary amine, and removal of the protecting group to obtain the desired (S)-3-(2-mercapto-1H-imidazol-5-yl)-2-(trialkylammonio)propanoate (I). This process affords a better yield and is capable of practical application at large scale.
这项发明涉及一种制备光学纯L-(+)-麦角硫胺的新工艺。L-麦角硫胺的化学合成过程包括以下步骤:将L-组氨酸烷基酯与酸卤、氯甲酸酯或吡碳酸酯在碱的存在下反应,水解烷基-(S,Z)-2,4,5-三氨基戊-4-烯酸酯以获得(S)-烷基2,5-二氨基-4-氧代戊酸酯,酸催化水解(S)-烷基2,5-二氨基-4-氧代戊酸酯,然后与金属硫氰酸盐反应以获得硫组氨酸,将硫组氨酸的硫保护为叔丁基硫醚,对一级胺进行二烷基化以获得三级胺,对三级胺进行季铵化,去除保护基以获得所需的(S)-3-(2-巯基-1H-咪唑-5-基)-2-(三烷基铵)丙酸酯(I)。这个工艺提供了更好的产率,并且适用于大规模实际应用。