一系列空间位作保香豆素(1)和白杨素官能化的三唑鎓盐(2,3)已经通过铜催化炔叠氮化物环加成和合成逐步Ñ烷基化方法。他们在AuCl(SMe 2)存在下用KHMDS进行一锅式去质子反应,从而可以高产率(75-92%)制备相应的三唑基亚金(I)配合物(4-6)。所有新化合物均通过1 H和13 C NMR光谱,FT-IR,元素分析以及在三唑F,三唑鎓1和金络合物4的情况下得到充分表征。,通过单晶X射线衍射。通过几种容易获得的苯胺的分子内加氢胺化反应,将新的三唑基亚金配合物(4-6)作为吲哚衍生物合成中的前催化剂进行了测试。
Asymmetric Hydrogenation of Unprotected Indoles Catalyzed by η<sup>6</sup>-Arene/<i>N</i>-Me-sulfonyldiamine–Ru(II) Complexes
作者:Taichiro Touge、Takayoshi Arai
DOI:10.1021/jacs.6b06295
日期:2016.9.7
Protecting-group-free transformation is a challenging and important issue in atom-economical organic synthesis. The η(6)-arene/N-Me-sulfonyldiamine-Ru(II)-BF4 complex-catalyzed asymmetric hydrogenation of 2-substituted unprotected indoles in weakly acidic hexafluoroisopropanol gives optically active indoline compounds with up to >99% ee. Under mild reaction media, halogen atoms and synthetically important
无保护基团转化是原子经济有机合成中一个具有挑战性和重要的问题。η(6)-芳烃/N-Me-磺酰二胺-Ru(II)-BF4 配合物催化2-取代的未保护吲哚在弱酸性六氟异丙醇中的不对称氢化得到具有高达>99% ee 的旋光二氢吲哚化合物。在温和的反应介质下,吲哚上的卤素原子和合成上重要的保护基团(例如甲硅烷基醚、缩醛、苄基醚和酯)得以保留,这有利于进一步合成复杂的二氢吲哚分子。
Au-catalyzed synthesis of 2-alkylindoles from N-arylhydroxylamines and terminal alkynes
作者:Yanzhao Wang、Longwu Ye、Liming Zhang
DOI:10.1039/c1cc12212f
日期:——
The first gold-catalyzed addition of N-arylhydroxylamines to aliphatic terminal alkynes is developed to access O-alkenyl-N-arylhydroxylamines, which undergo facile in situ sequential 3,3-rearrangements and cyclodehydrations to afford 2-alkylindoles with regiospecificity and under exceptionally mild reaction conditions.
Simple and Mild Synthesis of Indoles via Hydroamination Reaction Catalysed by NHC–Gold Complexes: Looking for Optimized Conditions
作者:Malina Michalska、Karol Grela
DOI:10.1055/s-0035-1560976
日期:——
An efficient heterocyclization of 2-alkynylanilines to indole derivatives has been developed. The reaction proceeds under very mild conditions using small amounts of a gold precatalyst. A range of substrates possessing various functional groups were employed, and the substituted indoles were obtained in very good yields.