Efficient <i>endo</i>
Cycloisomerization of Terminal Alkynols Catalyzed by a New Ruthenium Complex with 8-(Diphenylphosphino)quinoline Ligand and Mechanistic Investigation
作者:Tao Cai、Yu Yang、Wei-Wei Li、Wen-Bing Qin、Ting-Bin Wen
DOI:10.1002/chem.201703971
日期:2018.2.1
including [RuCl2(DPPQ)2] (1), [Ru(μ‐Cl)(DPPQ)2]2(BPh4)2 (2), and [RuCl(DPPQ)2Py](BF4) (3). Complex 2, with only 1 mol % loading, was found to be catalytically active for the endo cycloisomerization of various terminal alkynols to endo‐cyclic enol ethers in moderate to excellent yields. In particular, the 7‐ and 8‐endo heterocyclization can be achieved efficiently to give the seven‐membered 3‐benzoxepine and
合成了几种新的由P,N-供体配体8-(二苯基膦基)喹啉(DPPQ)支撑的钌配合物,包括[RuCl 2(DPPQ)2 ](1),[Ru(μ-Cl)(DPPQ)2 ]。2(BPh 4)2(2)和[RuCl(DPPQ)2 Py](BF 4)(3)。复杂2,仅1摩尔%的负载,被发现是用于催化活性的内切各种终端炔醇向环异构远藤在温和-环烯醇醚到优异的产率。特别是7-和8-内酯可以有效地实现杂环化,从而得到七元3-苯并xepine和八元3-苯并[ d ]氧辛酸衍生物。已经进行了2与各种炔醇底物的化学计量反应,以研究机理,从而导致了包括[RuCl(DPPQ)2 = CCH 2 C 6 H 4 CH 2 CH 2 O}](BPh 4)(12)和[RuCl(DPPQ)2 = CCH 2(CH 2)n CH 2 O}](BPh 4)(n = 3,12' ; n = 2,13 ; n = 1,14)。oxa