electron-deficient DIFLUORPHOS and SYNPHOS analogues in the rhodium-catalyzedasymmetric conjugate addition of boronic acids to α,β-unsaturatedketones afford the 1,4-addition adducts in yields up to 92% and with 99% ee. Particularly, a Rh-catalyzed asymmetric1,4-addition of arylboronic acids to nonsubstituted maleimide substrates using the (R)-3,5-diCF3-SYNPHOS ligand is also reported. This protocol provides access
Room-Temperature Rh-Catalyzed Asymmetric 1,4-Addition of Arylboronic Acids to Maleimides and Enones in the Presence of CF<sub>3</sub>-Substituted MeOBIPHEP Analogues
作者:Florent Le Boucher d’Herouville、Anthony Millet、Michelangelo Scalone、Véronique Michelet
DOI:10.1021/jo201073y
日期:2011.8.19
has been developed for the 1,4-addition of boronic acids to maleimides and enones under mild conditions at room temperature and led to succinimide derivatives and arylated cyclic ketones in good to excellent yields and ee. We uncovered the crucial role of the electronic and steric properties of diphosphine ligand and observed a strong boronic acid/ligand dependency in the case of maleimide derivatives
Direct Synthesis of Chiral 3-Arylsuccinimides by Rhodium-Catalyzed Enantioselective Conjugate Addition of Arylboronic Acids to Maleimides
作者:Balraj Gopula、Shu-Han Yang、Ting-Shen Kuo、Jen-Chieh Hsieh、Ping-Yu Wu、Julian P. Henschke、Hsyueh-Liang Wu
DOI:10.1002/chem.201501059
日期:2015.7.27
ligands L1–L10 were utilized in the enantioselective 1,4‐addition reaction of arylboronic acids to N‐substituted maleimides. In the presence of 2.5 mol % of RhI/L2, enantioenriched conjugate addition adducts were isolated in 72–99 % yields with 86–98 % ee. This protocol offers a convenient method to access a variety of 3‐arylsuccinimides in a highly enantioselective manner. Maleimides with readily cleavable
包含2,5-二芳基取代的双环[2.2.1]二烯配体L1 - L10的手性铑催化剂用于芳基硼酸与N-取代的马来酰亚胺的1,4-加成对映选择性反应。在存在2.5 mol%Rh I / L2的情况下,分离出对映体富集的共轭加合物,收率为72–99%,ee为86–98% 。该协议提供了一种方便的方法,可以以高对映选择性的方式访问各种3-芳基琥珀酰亚胺。具有易于裂解的N-保护基的马来酰亚胺被耐受,从而能够合成有用的合成中间体。吡咯烷4中,生物活性化合物和吡咯烷5,一个ENT -precursor到HSD-1抑制剂,合成以证明该方法的效用。
Chiral Norbornadienes as Efficient Ligands for the Rhodium-Catalyzed Asymmetric 1,4-Addition of Arylboronic Acids to Fumaric and Maleic Compounds
[reaction: see text] A rhodium-catalyzedasymmetric1,4-addition of arylboronic acids to fumaric and maleic compounds has been developed. While phosphorus-based chiralligands fail to induce high stereoselectivity, chiral norbornadiene ligands have proved to be uniquely effective to achieve high enantioselectivity in these 1,4-addition reactions.
Low-Temperature Rh-Catalyzed Asymmetric 1,4-Addition of Arylboronic Acids to α,β-Unsaturated Carbonyl Compounds
作者:Toshinobu Korenaga、Aram Ko、Kazuaki Shimada
DOI:10.1021/jo4014707
日期:2013.10.4
Rhodium-catalyzed asymmetric 1,4-addition of arylboronic acids to alpha,beta-unsaturated carbonyl compounds was achieved at temperatures below 0 degrees C using a Rh/MeO-F-12-BIPHEP catalyst. The reaction of cyclohexenone or N-R-maleimide with arylboronic acids proceeded even at -80 degrees C in the presence of the Rh catalyst. In the latter case, high enantioselectivity was observed because a low-temperature method was used, regardless of the type of substituent on maleimide.