Convenient General Asymmetric Synthesis of Roche Ester Derivatives through Catalytic Asymmetric Hydrogenation: Steric and Electronic Effects of Ligands
作者:Cyrielle Pautigny、Séverine Jeulin、Tahar Ayad、Zhaoguo Zhang、Jean-Pierre Genêt、Virginie Ratovelomanana-Vidal
DOI:10.1002/adsc.200800504
日期:2008.11.3
and concise asymmetric hydrogenation of acrylate esters promoted by the cationic ruthenium monohydride complex [Ru(H)(η6-cot)SYNPHOS]+BF4− is reported. A full investigation of the effects of catalyst precursors, solvents, temperature, hydrogen pressure, substrates as well as steric and electronic properties of ligands was carried out. The corresponding valuable Roche ester derivatives were obtained
通过促进丙烯酸酯的有效和简洁的不对称氢化的阳离子钌一氢化复杂的[Ru(H)(η 6 -cot)SYNPHOS] + BF 4 -报道。对催化剂前体,溶剂,温度,氢气压力,底物以及配体的空间和电子性质的影响进行了全面研究。在温和条件下,以良好至优异的分离产率和高对映选择性获得了相应的有价值的罗氏酯衍生物。通过合成3-羟基-2-甲基丙酸叔胺证明了这种高度对映选择性氢化的稳健性和实用性。克级的丁基丁酯,具有出色的收率和ee,最高可达94%。