Scandium triflate-catalyzed Strecker-type reactions of aldehydes, amines and tributyltin cyanide in both organic and aqueous solutions. Achievement of complete recovery of the tin compounds toward environmentally-friendly chemical processes
Described herein are compounds of formula (I), related compositions, and their use, for example in the formation of α-amino acids or a precursor thereof such as an α-aminonitrile.
TITANIUM COMPOUND AND PROCESS FOR ASYMMETRIC CYANATION OF IMINES
申请人:Seayad Abdul Majeed
公开号:US20100185000A1
公开(公告)日:2010-07-22
The present invention relates to titanium catalysts for asymmetric synthesis reactions produced by bringing a reaction mixture obtained by contacting water and a titanium alkoxide into contact with an optically active ligand represented by the general formula (a), wherein R
1
, R
2
, R
3
, and R
4
are independently a hydrogen atom, an alkyl group, or the like, and A* represents a group with two or more carbon atoms having an asymmetric carbon atom or axial asymmetry. The invention further relates to a process for asymmetric cyanation of imines, wherein the process comprises reacting an imine with a cyanating agent in the presence of the titanium catalyst.
US8859812B2
申请人:——
公开号:US8859812B2
公开(公告)日:2014-10-14
[EN] TITANIUM COMPOUND AND PROCESS FOR ASYMMETRIC CYANATION OF IMINES<br/>[FR] COMPOSÉ DU TITANE ET PROCÉDÉ DE CYANATION ASYMÉTRIQUE D'IMINES
申请人:AGENCY SCIENCE TECH & RES
公开号:WO2008121076A1
公开(公告)日:2008-10-09
[EN] The present invention relates to titanium catalysts for asymmetric synthesis reactions produced by bringing a reaction mixture obtained by contacting water and a titanium alkoxide into contact with an optically active ligand represented by the general formula (a), wherein R1, R2, R3, and R4 are independently a hydrogen atom, an alkyl group, or the like, and A* represents a group with two or more carbon atoms having an asymmetric carbon atom or axial asymmetry. The invention further relates to a process for asymmetric cyanation of imines, wherein the process comprises reacting an imine with a cyanating agent in the presence of the titanium catalyst. [FR] La présente invention porte sur des catalyseurs au titane pour des réactions de synthèse asymétrique que l'on effectue en amenant un mélange réactionnel obtenu par mise en contact d'eau et d'un alcoolate de titane en contact avec un ligand optiquement actif représenté par la formule générale (a), dans laquelle R1, R2, R3 et R4 sont indépendamment un atome d'hydrogène, un groupe alkyle ou similaire, et A* représente un groupe avec au moins deux atomes de carbone ayant un atome de carbone asymétrique ou une asymétrie axiale. L'invention porte également sur un procédé de cyanation asymétrique d'imines, suivant lequel on fait réagir une imine avec un agent de cyanation en présence du catalyseur au titane.
[EN] COMPOUNDS AND RELATED METHODS OF USE<br/>[FR] COMPOSÉS ET PROCÉDÉS D'UTILISATION S'Y RAPPORTANT
申请人:HARVARD COLLEGE
公开号:WO2011031764A2
公开(公告)日:2011-03-17
Described herein are compounds of formula (I), related compositions, and their use, for example in the formation of α-amino acids or a precursor thereof such as an α-aminonitrile.