[EN] PROCESS FOR PRODUCING CARBOXYLIC ACID ESTER<br/>[FR] PROCÉDÉ DE PRODUCTION D'UN ESTER D'ACIDE CARBOXYLIQUE
申请人:SUMITOMO CHEMICAL CO
公开号:WO2012176930A1
公开(公告)日:2012-12-27
An object of the present invention is to provide a new process which can produce a carboxylic acid ester from an aldehyde. The object is achieved by a process for producing a carboxylic acid ester, including the step of mixing a compound represented by the formula (2-1): (wherein R2 represents an alkyl group optionally having a substituent, or the like; R3 and R4 each represent independently an alkyl group optionally having a substituent, or the like, or R3 and R4 are taken together to form a divalent hydrocarbon group optionally having a substituent, or the like; Y represents a group represented by -S- or a group represented by -N(R5)-; R5 represents an alkyl group optionally having a substituent, or the like, or R5 is taken together with R4 to form a divalent hydrocarbon group optionally having a substituent; and X- represents an anion), a base, an alcohol, oxygen and an aldehyde to oxidize the aldehyde.
Substrate-Controlled and Site-Selective [3+2] Cycloadditions of N-Heterocyclic Carbene Derived Ambident Dipoles
作者:Ying Cheng、Mei-Fang Liu、De-Cai Fang、Xue-Mei Lei
DOI:10.1002/chem.200601482
日期:2007.5.18
2-aryl thiocarbamoyl benzimidazolium and imidazolinium inner salts derived from benzimidazole and imidazoline carbenes are unique ambident C-C-S and C-C-N 1,3-dipolar systems, which undergo highly efficient and site-selective cycloaddition reactions with dimethyl acetylenedicarboxylate or dibenzoylacetylene to furnish spiro(imidazole-2,3'-thiophene) derivatives in excellent yields. When treated with
Nucleophilic addition to substituted 1<i>H</i>-4,5-dihydroimidazolium salts
作者:Alejandra Salerno、Vanina Ceriani、Isabel A. Perillo
DOI:10.1002/jhet.5570340302
日期:1997.5
representing the transfer of the C-2 unit to a nucleophilic carbon. With alkaline cyanides salts 1 react efficiently affording α,α-diaminonitriles 5. In these compounds the cyano group may be readily substituted by nucleophiles (hydroxyl anion, species with nucleophilic carbon and reagents that act by hydride ion transfer), in a way similar to the salts but with better yields.
1 H -4,5-二氢咪唑鎓盐1容易与产生环状产物的亲核试剂反应,该环状产物可以是稳定的或转化为维持结构乙二胺单元的无环化合物。用甲基碘化镁化合物1e可得到预期的咪唑烷,但在取代的1-芳基-3-甲基-2-苯基盐1b-d的情况下,分离出N-芳基-N'-甲基乙二胺3b-d和苯乙酮(4) ,代表C-2单元向亲核碳转移的过程。与碱性氰化物盐1有效反应,得到α,α-二氨基腈5。在这些化合物中,氰基可以很容易地被亲核试剂(羟基阴离子,具有亲核碳的物质以及通过氢化物离子转移作用的试剂)取代,类似于盐,但收率更高。
METHOD FOR PRODUCING METHIONINE
申请人:HAGIYA Koji
公开号:US20130072713A1
公开(公告)日:2013-03-21
A novel method for producing methionine without using hydrogen cyanide as a raw material has been demanded. A method for producing methionine including a step A of oxidizing 4-methylthio-2-oxo-1-butanal in the presence of an alcohol; a step B of hydrolyzing a 4-methylthio-2-oxo-butanoic acid ester obtained in the step A; and a step C of subjecting 4-methylthio-2-oxo-butanoic acid obtained in the step B to reductive amination.
The present invention relates to a process for producing an α-ketocarboxylic acid, comprising a step of oxidizing an α-ketoaldehyde by mixing a base, carbon dioxide, the α-ketoaldehyde and a compound represented by formula (2-1).