Palladium(II)-catalyzed dicarboxymethylation of chiral allylic alcohols: chirality transfer affording optically active diesters containing three contiguous chiral centers
作者:Othman Hamed、Patrick M. Henry、Daniel P. Becker
DOI:10.1016/j.tetlet.2010.04.105
日期:2010.7
This manuscript describes the extension of Stille’s palladium-catalyzed olefin dicarbonylation reaction to chiralallylicalcohols with chiralitytransfer to afford the corresponding chiralalcohol functionalized with bis-carbomethoxy esters, containing three contiguous chiral centers, in good to excellent diastereoselectivities (78–98%).
Synthesis of <scp>Planar‐Chiral</scp> [2.2]<scp>Paracyclophane‐Based Oxazole‐Pyrimidine</scp> Ligands and Application in <scp>Nickel‐Catalyzed</scp> 1,<scp>2‐Reduction</scp> of α,<scp>β‐Unsaturated</scp> Ketones
structure and large steric hindrance performed successfully in nickel-catalyzed asymmetric 1,2-reduction of α,β-unsaturatedketones, affording the chiral allylic alcohols with up to 99% yield and 99% ee. Meanwhile, this reduction reaction could be conducted on gram-scale without loss of activity and enantioselectivity, and the chiral ligand could be conveniently recovered with high yield.
Kinetic Resolution of Secondary Alcohols Using Amidine-Based Catalysts
作者:Ximin Li、Hui Jiang、Eric W. Uffman、Lei Guo、Yuhua Zhang、Xing Yang、Vladimir B. Birman
DOI:10.1021/jo202220x
日期:2012.2.17
Kinetic resolution of racemic alcohols has been traditionally achieved via enzymatic enantioselective esterification and ester hydrolysis. However, there has long been considerable interest in devising nonenzymatic alternative methods for this transformation. Amidine-based catalysts (ABCs), a new class of enantioselective acyl transfer catalysts developed in our group, have demonstrated, inter alia, high efficacy in the kinetic resolution of benzylic, allylic, and propargylic secondary alcohols and 2-substituted cycloalkanols, and thus provide a viable alternative to enzymes.
HAYASHI, TAMIO;YAMAMOTO, AKIHIRO;HAGIHARA, TOSHIYA, J. ORG. CHEM., 1986, 51, N 5, 723-727