Enantioselective Rh-Catalyzed Hydrogenation of <i>N</i>-Formyl Dehydroamino Esters with Monodentate Phosphoramidite Ligands
作者:Lavinia Panella、Alicia Marco Aleixandre、Gerlof J. Kruidhof、Jort Robertus、Ben L. Feringa、Johannes G. de Vries、Adriaan J. Minnaard
DOI:10.1021/jo052451d
日期:2006.3.1
a range of aldehydes and with cyclohexanone. A highly convenient multigram scale one step synthesis of methyl 2-(formamido)acrylate was developed. This compound was used in the synthesis of methyl 2-(formamido)cinnamate via a solvent free Heck reaction. Moreover, full conversion and >99% ee were obtained in 1 h in the hydrogenation of methyl 2-(formamido)acrylate with 0.2 mol % catalyst and 2 bar hydrogen
使用单齿亚磷酰胺作为手性配体,在铑催化的N-甲酰基脱氢氨基酯的不对称加氢中,对映选择性达到> 99%ee 。通过将异氰基乙酸甲酯与一定范围的醛和环己酮缩合来合成底物。开发了一种高度方便的多克规模的2-(甲酰胺基)丙烯酸甲酯一步合成方法。该化合物用于通过无溶剂的Heck反应合成2-(甲酰胺基)肉桂酸甲酯。而且,在2-h(甲酰氨基)丙烯酸甲酯在0.2 mol%的催化剂和2 bar的氢气压力下加氢,在1小时内获得了完全转化率和> 99%ee。甲酰基保护剂的多功能性是通过在温和条件下将其除去而建立的。