The AZARYPHOS Family of Ligands for Ambifunctional Catalysis: Syntheses and Use in Ruthenium-Catalyzed anti-Markovnikov Hydration of Terminal Alkynes
作者:Lukas Hintermann、Tuan Thanh Dang、Aurélie Labonne、Thomas Kribber、Li Xiao、Pance Naumov
DOI:10.1002/chem.200900563
日期:2009.7.20
others. The scalable syntheses proceed in a few steps. The incorporation of AZARYPHOS ligands (L) into complexes [RuCp(L)2(MeCN)][PF6] (Cp=cyclopentadienyl) gives catalysts for the anti‐Markovnikov hydration of terminal alkynes of the highest known activities. Electronic and steric ligand effects modulate the reaction kinetics over a range of two orders of magnitude. These results highlight the importance
引入了AZARYPHOS(氮杂-芳基-膦)膦配体家族,该膦配体在配体的外围具有膦单元和空间屏蔽的氮孤对,是通过配体球中的金属中心和氮孤对发展双官能催化的工具。已开发出通用的合成策略来合成25种结构多样的(6-芳基-2-吡啶基)膦(ARPYPHOS),(6-烷基-2-吡啶基)膦(ALPYPHOS),4,6-二取代1,3的实例-二氮杂-2-基膦或1,3,5-三嗪-2-基膦,喹唑啉基膦,喹啉基膦等。可扩展的合成过程分几步进行。将AZARYPHOS配体(L)掺入配合物[RuCp(L)2(MeCN)] [PF 6](Cp =环戊二烯基)给出了已知活性最高的末端炔烃的反马尔科夫尼科夫水合反应的催化剂。电子和空间配体效应在两个数量级的范围内调节反应动力学。这些结果突出了在通过金属及其配体发展合作性双官能催化的过程中使用结构多样的配体家族的重要性。