专利号:US-7767826-B2 优先权日:2007-10-05 标题 :Process for the synthesis of L-(+)-ergothioneine 发明人:TRAMPOTA MIROSLAV 权利人:PHARMATECH INTERNATIONAL INC 摘要: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.
专利号:US-2009093642-A1 优先权日:2007-10-05 标 题 :Process for the synthesis of l-(+)-ergothioneine
专利号:WO-2009045413-A1 优先权日:2007-10-05 标 题 :Process for the synthesis of l-(+)-ergothioneine
专利号:US-7307177-B2 优先权日:2004-12-17 标题:Metallocene complexes, their synthesis and use in catalyst systems for olefin polymerization 发明人:HUANG LEGAL REPRESENTATIVE JIL; CANICH JO ANN M; COKER CATALINA L 权利人:EXXONMOBIL CHEM PATENTS INC 摘要:A metallocene complex is represented by the the formulan n(C p R 5 ) n MX k n nwhere C p (each occurrence) is a cyclopentadienyl group; each of the five R substituents on the or each cyclopentadienyl group is independently selected from hydrogen, C 1 to C 30 substituted or unsubstituted hydrocarbyl, halohydrocarbyl, silylhydrocarbyl or silylhalohydrocarbyl, wherein two adjacent R substituents may be joined to form part of a saturated, partially unsaturated or aromatic monocyclic or polycyclic ring structure, and SiR′ 2 NR″ 2 where each of the two R′ substituents is independently selected from hydrogen, C 1 to C 30 substituted or unsubstituted hydrocarbyl, halohydrocarbyl, silylhydrocarbyl or silylhalohydrocarbyl, wherein two adjacent R′ substituents may be joined to form part of a saturated, partially unsaturated or aromatic monocyclic or polycyclic ring structure, and each of the two R″ substituents is independently selected from C 2 to C 30 substituted or unsubstituted hydrocarbyl, halohydrocarbyl, silylhydrocarbyl or silylhalohydrocarbyl, wherein two adjacent R″ substituents may be joined to form part of a saturated, partially unsaturated or aromatic monocyclic or polycyclic ring structure; n is 1 or 2; M is a metal of valence m from Groups 4 to 11 of the Periodic Table of Elements, k is equal to m minus n and the or each X substituent is a univalent anionic ligand, or two X substituents are joined and bound to the metal atom to form a metallocycle ring, or two X substituents are joined to form a chelating ligand, a diene ligand, or an alkylidene ligand, provided that at least one R substituent on the or one cyclopentadienyl group is SiR′ 2 NR″ 2 , provided that at least one R substituent on at least one C p is SiR′ 2 NR″ 2 and provided that one or the C p may be bridged by a bridging group to another C p group, or a heteroatom containing group, where the bridging group replaces one R group on the C p group(s) or a hydrogen on a heteratom containing group.
专利号:US-7312347-B2 优先权日:2005-09-22 标题 :Substituted optically active disphosphine compound 发明人:FUJIWARA TAKAHIRO; YOKOZAWA TOHRU 权利人:TAKASAGO PERFUMERY CO LTD 摘要:Provided is a method for producing an optically active compound, in more detail, for producing an optically active compound by asymmetric hydrogenation in a high yield and asymmetric yield. The present invention also provides a catalyst for asymmetric synthesis for the above production method, especially a catalyst for asymmetric hydrogenation, containing a transition metal complex. Further, the present invention provides a new diphosphine compound useful as a ligand of the above transition metal complex and a new transition metal complex containing the above diphosphine compound. n The present invention relates to a diphosphine compound represented by the following formula (1): n na transition metal complex using the compound, a catalyst for asymmetric synthesis comprising the above transition metal complex and a method for producing an optically active compound using the above catalyst for asymmetric synthesis.
专利号:US-7754889-B2 优先权日:2004-03-29 标题 :Optically active transition metal-diamine compound and process for producing optically active alcohol with the same 发明人:AMANO AKIRA; IGARASHI DAISUKE; SAYO NOBORU 权利人:TAKASAGO PERFUMERY CO LTD 摘要:The present invention provides a water-soluble transition metal-diamine complex which can be easily separated from reaction products through liquid separation, etc. and is recycleable; an optically active diamine compound constituting the ligand of the complex; and a catalyst for asymmetric synthesis which comprises these. The present invention relates to a water-soluble optically active transition metal-diamine complex represented by the formula (2): n n[wherein R 1 and R 2 each represents hydrogen, a hydrocarbon group, —SO 2 R 13 (wherein R 13 is a hydrocarbon group, substituted amino, etc.), etc.; R 3 to R 12 each represents hydrogen, a hydrocarbon group, alkoxy, substituted amino, etc.; M represents a transition metal; X represents halogen; L represents a ligand; and * indicates an asymmetric carbon atom; provided that at least one of R 3 to R 7 and R 8 to R 12 is substituted amino], a catalyst for asymmetric synthesis containing the complex, and a process for producing an optically active alcohol, which comprises using the catalyst to asymmetrically reduce a ketone.