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
镍(II)可用于催化2-甲基四氢呋喃(2-MeTHF)中2-炔基芳基异硫氰酸酯和异腈的异[2 + 2 + 1]环加成反应,生成各种各样的噻吩并[2,3- b ]吲哚高产。该反应的特征在于,在不添加任何添加剂(其他还原剂和外部配体)的情况下,在空气条件下使用低至0.3 mol%的乙酰丙酮镍(II)[Ni(acac)2 ]。这是第一个成功将镍(II)直接用于杂[2 + 2 + 1]环加成反应的成功例子。