The efficient resolution of protected diols and hydroxy aldehydes by lipases: steric auxiliary approach and synthetic applications
摘要:
1,n-Diols (n = 2 - 5) and 2-hydroxy aldehydes protected with a steric auxiliary are transformed by Pseudomonas lipases with high enantioselectivity, thus allowing the efficient resolution of these molecules and the synthesis of related derivatives with high optical purity.
Design, scope and mechanism of highly active and selective chiral NHC–iridium catalysts for the intramolecular hydroamination of a variety of unactivated aminoalkenes
Chiral, cationic NHC–iridium complexes are introduced as catalysts for the intramolecular hydroamination reaction of unactivated aminoalkenes. The catalysts show high activity in the construction of a range of 5- and 6-membered N-heterocycles, which are accessed in excellent optical purity, with various functional groups being tolerated with this system. A major deactivation pathway is presented and
引入手性阳离子 NHC-铱配合物作为未活化氨基烯烃分子内氢胺化反应的催化剂。该催化剂在构建一系列 5 元和 6 元 N 杂环时表现出高活性,这些杂环具有优异的光学纯度,并且该系统可以耐受各种官能团。通过使用替代反应条件呈现和消除主要的失活途径。对反应机理进行了详细的实验和计算研究,为催化系统的作用模式提供了有价值的见解,并指出了对该催化平台的未来修改。
Collection of Traceable Compounds and Uses Thereof
申请人:Hibert Marcel Francois Louis
公开号:US20080176763A1
公开(公告)日:2008-07-24
The invention concerns the use of a collection of compounds of general formula (I), wherein: n is 0 or 1; p represents an integer between 1 and 6; r represents an integer between 1 and 12; R
1
and R′
1
represent in particular a hydrogen atom; R
2
represents an amino acid side chain or an amino acid derivative; R
3
represents a group derived from a carboxylic acid, bearing a basic entity; R
4
represents in particular an alkyl group containing 1 to 10 carbon atoms; and A represents a hydrogen atom, a protecting group or a tracing group, in particular a fluorophor, a colouring agent or a quencher, for determining, through binding studies, ligands of receptors whose ligand is unknown or whose ligand useful for carrying out specific affinity binding assays is unknown.