Rh-Catalyzed Asymmetric 1,4-Addition of Arylboronic Acids to α,β-Unsaturated Ketones with DIFLUORPHOS and SYNPHOS Analogues
作者:Farouk Berhal、Zi Wu、Jean-Pierre Genet、Tahar Ayad、Virginie Ratovelomanana-Vidal
DOI:10.1021/jo201187c
日期:2011.8.5
electron-deficient DIFLUORPHOS and SYNPHOS analogues in the rhodium-catalyzed asymmetric conjugate addition of boronic acids to α,β-unsaturated ketones afford the 1,4-addition adducts in yields up to 92% and with 99% ee. Particularly, a Rh-catalyzed asymmetric 1,4-addition of arylboronic acids to nonsubstituted maleimide substrates using the (R)-3,5-diCF3-SYNPHOS ligand is also reported. This protocol provides access
缺电子的DIFLUORPHOS和SYNPHOS类似物在铑催化的不对称共轭硼酸向α,β-不饱和酮的铑催化不对称共轭加成中的应用可产生1,92加成的加合物,收率高达92%,ee为99%。特别地,还报道了使用(R)-3,5-diCF 3 -SYNPHOS配体将Rh催化的芳基硼酸不对称的1,4-加成至未取代的马来酰亚胺底物。该方案提供了获得高生物活性的各种对映体富集的3-取代的琥珀酰亚胺单元的途径,高收率和良好至优异的ee可达93%,单次结晶后可将其升级为高达99%ee。