Exploiting the Reactivity of Isocyanide: Coupling Reaction between Isocyanide and Toluene Derivatives Using the Isocyano Group as an N1 Synthon
作者:Zhiqiang Liu、Xinglu Zhang、Jianxiong Li、Feng Li、Chunju Li、Xueshun Jia、Jian Li
DOI:10.1021/acs.orglett.6b01928
日期:2016.8.19
An unusual oxidative coupling reaction of isocyanide and toluene derivatives using tetrabutylammonium iodide (TBAI) as a catalyst is disclosed. The experimental results and mechanistic study show that the isocyano group acts formally as an N1 synthon during the transformation, thus expanding the reactivity profile of isocyanide.
Nickel Catalysis Enables Hetero [2+2+1] Cycloaddition between Yne-Isothiocyanates and Isonitriles with Low Catalyst Loading
作者:Rui-Juan Liu、Peng-Fei Wang、Wen-Kui Yuan、Li-Rong Wen、Ming Li
DOI:10.1002/adsc.201601271
日期:2017.4.17
Nickel(II) can be used to catalyze the hetero [2+2+1] cycloaddition of 2‐alkynylaryl isothiocyanates and isonitriles in 2‐methyltetrahydrofuran (2‐MeTHF) to give a wide array of thieno[2,3‐b]indoles in excellent yields. The reaction is featured by employing as little as 0.3 mol% nickel(II) acetylacetonate [Ni(acac)2] under air conditions in the absence of any additives (additional reducing agents and
C–H functionalization enabled stereoselective Ugi-azide reaction to α-tetrazolyl alicyclic amines
作者:Surajit Haldar、Subhajit Saha、Sumana Mandal、Chandan K. Jana
DOI:10.1039/c8gc01544a
日期:——
novel reaction produces α-tetrazolyl N-heterocycles directly from N-heterocycles without involving pre-functionalization/pre-oxidation steps. Importantly, the stereoselective reaction involving chiral amines or chiral isocyanides allowed the expeditious syntheses of nucleoside analogs and α-tetrazolyl pyrrolidine in enantioenriched form.
TiCl<sub>4</sub>-Mediated Preparation of Thiophthalide Derivatives via Formal Thio-Passerini Reactions
作者:Sudipta Ponra、Aude Nyadanu、Laurent El Kaïm、Laurence Grimaud、Maxime R. Vitale
DOI:10.1021/acs.orglett.6b01937
日期:2016.8.19
By the formal extension of the Passerini reaction to thiocarbonyl derivatives, the straightforward preparation of thiophthalides is disclosed. This method involves the intermediate formation of a sulfanyl-phthalide and a titaniumtetrachloride mediated isocyanide insertion reaction. When tert-butyl thiol is used, thanks to the deprotection of the tert-butyl group, a thiophthalide resulting from a 1
Electrochemical TEMPO-catalyzed multicomponent C(sp<sup>3</sup>)–H α-carbamoylation of free cyclic secondary amines
作者:Na Pan、Johanne Ling、Ramiro Zapata、Jean-Pierre Pulicani、Laurence Grimaud、Maxime R. Vitale
DOI:10.1039/c9gc03173a
日期:——
We report here an original electrosynthetic method allowing the straightforward C(sp3)–H α-carbamoylation of free cyclicsecondaryamines. Based on a TEMPO-catalyzed indirect anodic oxidation and a multicomponent coupling, a wide variety of N-acyl α-carboxamides have been obtained under remarkably mild and sustainable reaction conditions.