Polypyridyl iridium(III) based catalysts for highly chemoselective hydrogenation of aldehydes
作者:Mallesh Pandrala、Angel Resendez、Sanjay V. Malhotra
DOI:10.1016/j.jcat.2019.08.025
日期:2019.10
polypyridyl iridium(III) catalysts, [Ir(tpy)(L)Cl](PF6)2 where tpy = 2,2′:6′,2′'-Terpyridine, L = phen (1,10-Phenanthroline), Me2phen (4,7-Dimethyl-1,10-phenanthroline), Me4phen (3,4,7,8-Tetramethyl-1,10-phenanthroline), Me2bpy (4,4′-Dimethyl-2–2′-dipyridyl)} for the chemoselective reduction of aldehydes to alcohols in aqueous ethanol and sodium formate as the hydride source. The reaction can be carried
使用HCOOR(R = H,Na,NH 4)作为氢源的铱催化的羰基化合物的转移加氢(TH)是关键过程,因为它提供了清洁的过程并且易于执行。但是,现有的高效铱催化剂只能在较窄的pH值下工作。因此,不适用于各种各样的基板。因此,开发在宽pH范围内工作的新型催化剂是必不可少的,因为它可以获得更广阔的应用范围。在这里我们报告了高效的聚吡啶基铱(III)催化剂[Ir(tpy)(L)Cl](PF 6)2 其中tpy = 2,2':6',2''-三联吡啶,L = phen(1 ,10-菲咯啉),Me 2 phen(4,7-二甲基-1,10-菲咯啉),Me 4苯(3,4,7,8-四甲基-1,10-菲咯啉),Me 2bpy(4,4'-Dimethyl-2–2'-dipyridylyl)}用于将乙醛在乙醇水溶液和甲酸钠作为氢化物来源中化学选择性还原为醇。该反应可在pH范围6至11的宽pH范围内有效地进行。这