Catalytic asymmetric carbon–carbon bond formation using alkenes as alkylmetal equivalents
作者:Rebecca M. Maksymowicz、Philippe M. C. Roth、Stephen P. Fletcher
DOI:10.1038/nchem.1394
日期:2012.8
Catalytic asymmetric conjugate addition reactions with organometallicreagents are powerful reactions in synthetic chemistry. Procedures that use non-stabilized carbanions have been developed extensively, but these suffer from a number of limitations that prevent their use in many situations. Here, we report that alkylmetal species generated in situ from alkenes can be used in highly enantioselective
The present invention provides processes for the production of chiral compounds in a stereoisomeric excess. The present processes involve reacting a hydrometallated alkene compound with a compound comprising a conjugated-bond system under conditions such that the compounds undergo an asymmetric 1,4- or 1,6-conjugate addition reaction, generating a chiral compound in a stereoisomeric excess. The reaction is performed in the presence of a metal catalyst, which catalyst preferably comprises a non-racemic chiral ligand.
[EN] ASYMMETRIC SYNTHESIS OF ORGANIC COMPOUNDS<br/>[FR] SYNTHÈSE ASYMÉTRIQUE DE COMPOSÉS ORGANIQUES
申请人:ISIS INNOVATION
公开号:WO2013054131A1
公开(公告)日:2013-04-18
The present invention provides processes for the production of chiral compounds in a stereoisomeric excess. The present processes involve reacting a hydrometallated alkene compound with a compound comprising a conjugated -bond system under conditions such that the compounds undergo an asymmetric 1,4- or 1,6-conjugate addition reaction, generating a chiral compound in a stereoisomeric excess. The reaction is performed in the presence of a metal catalyst, which catalyst preferably comprises a non-racemic chiral ligand.
Development of Axially Chiral Cyclo-Biaryldiol Ligands with Adjustable Dihedral Angles
作者:Pengxiang Zhang、Jipan Yu、Fei Peng、Xudong Wu、Jiyang Jie、Can Liu、Hua Tian、Haijun Yang、Hua Fu
DOI:10.1002/chem.201603706
日期:2016.11.21
A new type of axially chiral cyclo‐[1,1′‐biphenyl]‐2,2′‐diol (CYCNOL) ligands with adjustable dihedral angles have been developed by varying the bridge chain length. Eight‐, nine‐ and ten‐membered cyclo‐ligands were prepared and evaluated by using two representative examples: enantioselectiveadditions of diethylzinc to aldehydes and organometallic reagents to enones. The results revealed that the