Access to Biaryl Sulfonamides by Palladium-Catalyzed Intramolecular Oxidative Coupling and Subsequent Nucleophilic Ring Opening of Heterobiaryl Sultams with Amines
作者:Joydev K. Laha、Neetu Dayal、Krupal P. Jethava、Dilip V. Prajapati
DOI:10.1021/acs.orglett.5b00290
日期:2015.3.6
The installation of sulfonamide pharmacophores on heterobiaryls has successfully been executed by a previously unknown palladium-catalyzedintramolecularoxidative coupling in N-arylsulfonyl heterocycles followed by novel ring opening of heterobiaryl sultams with amine nucleophiles. The protocol has a wide scope of substrates warranting broad applications in the synthesis of heterobiaryls containing
Diastereoselective Friedel−Crafts Alkylation of Indoles with Chiral α-Phenyl Benzylic Cations. Asymmetric Synthesis of <i>Anti</i>-1,1,2-Triarylalkanes
作者:John Y. L. Chung、Danny Mancheno、Peter G. Dormer、Narayan Variankaval、Richard G. Ball、Nancy N. Tsou
DOI:10.1021/ol800858c
日期:2008.7.17
The reactions of chiral benzyl carbocations bearing alpha-phenyl substituents with N-sulfonylated indoles afford 1,1,2-triarylalkanes with anti-selectivities. This outcome is a reversal of facial diastereoselectivity relative to Bach's alpha-alkyl-bearing benzyl cations. The reactions are promoted by either a Bronsted acid (TFA) or Lewis acid (BF3.OEt2), offering differential diastereoselectivities
Triflic acid controlled successive annelation of aromatic sulfonamides: an efficient one-pot synthesis of N-sulfonyl pyrroles, indoles and carbazoles
作者:Mohammed Abid、Liliana Teixeira、Béla Török
DOI:10.1016/j.tetlet.2007.04.021
日期:2007.6
A novel one-pot synthesis of N-substituted heterocycles via successive cyclization/annelation starting from primary sulfonamides is described. This process leads directly to N-sulfonyl pyrroles, indoles and carbazoles. The selection of appropriate reactant/triflic acid ratio successfully controls the formation of the desired product.
Two direct synthetic methods of 1,2,3,4-tetrahydro-β-carboline derivatives have been developed. After initial indole formation by copper-catalyzed domino three-component coupling−cyclization using an appropriate ethynylaniline, aldehyde, and a secondary amine, treatment with t-BuOK/hexane or MsOH afforded the desired tetrahydro-β-carboline derivatives in moderate to good yields.
In order to find compounds with superior anti human immunodeficiency virus type 1 (HIV-1) activity, twelve simple N-arylsulfonylindoles (3a—l) were synthesized and preliminarily evaluated as HIV-1 inhibitors in vitro for the first time. Several compounds demonstrated significant anti-HIV-1 activity, especially N-(3-nitrobenzene)sulfonyl-6-methylindole (3h) and N-(3-nitrobenzene)sulfonylindole (3i) showed the highest anti-HIV-1 activity with EC50 values of 0.26 and 0.74 μg/ml, and TI values of 543.78 and >270.27, respectively.