Nickel-Catalyzed Cyanation of Aryl Halides and Hydrocyanation of Alkynes via C–CN Bond Cleavage and Cyano Transfer
作者:Hui Chen、Shuhao Sun、Yahu A. Liu、Xuebin Liao
DOI:10.1021/acscatal.9b04586
日期:2020.1.17
methods to prepare aryl nitriles and vinyl nitriles from arylhalides and alkynes, respectively. Using inexpensive and non-toxic 4-cyanopyridine N-oxide as the cyano shuttle, the methods provide an efficient approach to prepare aryl cyanides and vinyl nitriles under mild and operationally simple reaction conditions with a broad range of functional group tolerance. In hydrocyanation of alkynes, the method
Direct C-S Bond Functionalization of Benzyl Mercaptan
作者:Khokan Choudhuri、Milan Pramanik、Prasenjit Mal
DOI:10.1002/ejoc.202000521
日期:2020.7.7
Using 1,10‐phenanthroline as organocatalyst and t BuOK as base, cascaded activation of three different bonds: C(sp3)–H, benzylic C–S, and aryl–halide could be achievable in one pot.
corresponding chiral 2,3-disubstituted-1-indanols 2 by ruthenium(II)-catalyzed dynamic kinetic resolution–asymmetric transfer hydrogenation. In particular, this route offers a practical access to a new class of conformationally rigid enantiopure 1,4-diols 2k–m having four contiguous chiral centers. Transformation of ent-2k into a Pallidol analogue via a highly diastereo- and regioselective Friedel–Crafts
CuCl-Catalyzed Regio- and Stereoselective Aminohalogenation of α,β-Unsaturated Nitriles
作者:Jian-Lin Han、San-Jun Zhi、Le-Yong Wang、Yi Pan、Guigen Li
DOI:10.1002/ejoc.200600902
日期:2007.3
α,β-Unsaturatednitriles were found to be suitable substrates for aminochlorination with N,N-dichloro-p-toluenesulfonamide (4-TsNCl2) in the presence of CuCl as the catalyst (10 mol-%) and 4 A molecular sieves. The reaction is very convenient to carry out at room temperature without the protection of inert gases, and this method provides an easy route to vicinal haloamino nitriles with excellent regio-