[EN] PROCESS FOR THE SYNTHESIS OF L-(+)-ERGOTHIONEINE<br/>[FR] PROCÉDÉ DE SYNTHÈSE DE LA L-(+)-ERGOTHIONÉINE
申请人:PHARMATECH INTERNATIONAL INC
公开号:WO2009045413A1
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 ttiiohistidine as the te/f-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-1 H-imidazol-5-yl)-2-(trialkylammonio)propanoate (l). This process affords a better yield and is capable of practical application at large scale.
本发明涉及一种制备光学纯L-(+)-麦角硫氨酸的新工艺。该化学合成L-麦角硫氨酸的过程包括以下步骤:在碱的存在下,将L-组氨酸烷基酯与酸卤、氯甲酸酯或者吡碳酸酯反应,水解烷基-(S,Z)-2,4,5-三酰基戊-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麦角氨酸,将硫麦角氨酸的硫保护为对叔丁基硫醚,将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-1 H-咪唑-5-基)-2-(三烷基铵)丙酸盐(l)。该工艺具有更好的产量,并且可以在大规模实际应用中使用。