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
The first examples of CS induced PausonâKhand type reactions are described; 2-alkynylphenyl isothiocyanates were converted to 3-substituted-2H-thieno[2,3-b]indol-2-ones in the presence of a stoichiometric amount of Mo(CO)6 or Co2(CO)8, or a catalytic amount of Rh catalyst under an atmospheric pressure of carbon monoxide.
Tandem addition–cyclization of o-ethynylphenyl isothiocyanates with N nucleophiles; difference of cyclization mode between primary and secondary amines
作者:Mamoru Kaname、Haruki Sashida
DOI:10.1016/j.tetlet.2011.11.133
日期:2012.2
mode cyclization of the N-(2-ethynylphenyl)thioureas, which were easily obtained from the o-ethynylphenyl isothiocyanates and the primary amines, to provide the 2-imino-4-methylidene-1H-benzo[d][1,3]thiazines as the sole product in excellent yields. The secondaryamines reacted with the o-ethynylphenyl isothiocyanates to give both the 6-exo and 5-endo-dig mode cyclization products under the same conditions
三氟甲磺酸银促进了N-(2-乙炔基苯基)硫脲的6-exo-dig模式环化反应,这是很容易从邻乙炔基苯基异硫氰酸酯和伯胺获得的,从而提供了2-亚氨基-4-亚甲基-1 H作为唯一产品的-苯并[ d ] [1,3]噻嗪具有极好的收率。仲胺与邻乙炔基苯基异硫氰酸酯在相同条件下反应,生成6-exo和5-endo-dig模式环化产物。
TfOH-promoted transformation from 2-alkynylphenyl isothiocyanates to quinoline-2-thiones or indoles
A variety of 4-arylquinoline-2-thiones and 3-arylthieno[2,3-b]indoles were synthesized in high yields via TfOH-promoted tandem Friedel-Crafts alkenylation-cyclization reactions of 2-alkynylphenyl isothiocyanates. (c) 2009 Elsevier Ltd. All rights reserved.
Synthesis of Quinoline-2-thiones via Tandem Indium(III)-Promoted Friedel−Crafts Alkenylation−Cyclization of 2-Alkynylphenyl Isothiocyanates
A new approach to the synthesis of 4-aryl- or 4-arylthioquinoline-2-thiones via indium(111) reagent-mediated tandem Friedel-Crafts alkenylationcyclization of 2-alkynylphenyl isothiocyanates is described.