Synthesis and Antifungal Activities of Pyridine Bioisosteres of a Bismuth Heterocycle Derived from Diphenyl Sulfone
摘要:
Heterocyclic iodobismuthanes 7-9 [IBi(C6H4-2-SO2C5H3N-1'-)] derived from phenyl pyridinyl sulfones were synthesized. Their antifungal activities against the yeast Saccharomyces cerevisiae were compared with those of halobismuthanes [XBi(RC6H3-2-SO2C6H4-1'-)] (1: X=Cl; 2: X=I, R=H) derived from diphenyl sulfone derivatives to determine how the bioisosteric replacement of the benzene ring in 2 with the pyridine ring in 7-9 affects their activities. The antifungal activities of 7-9 were higher or comparable to those of 1 and 2. The DFT calculations suggested that the generation of the antifungal activity of the bismuthanes was well understood by the nucleophilic addition of methanethiolate anion as a model biomolecule at the bismuth atom to give an intermediate ate complex.
provide efficient synthetic access to heteroaryl sulfones in two-steps using a simple palladium–1,1′-bis[(diphenyl)phosphanyl]ferrocene catalyst to form in high yields variously functionalized heteroaromatic thioethers. Pyridinyl-containing substrates can be subsequently selectively oxidized into sulfones and NH-sulfoximines by using very mild oxidation conditions with a high functional group tolerance
electrophiles in Ni-catalyzed Suzuki-Miyaura cross-coupling reactions. The C-sulfone bond in the α-oxo-vinylsulfone motif is cleaved chemoselectively in these reactions, furnishing C-aryl glycals or acyclic vinyl ethers in high yields. These reactions proceed under mild conditions and tolerate a remarkable scope of heterocycles and functional groups. Preliminary mechanistic studies revealed the importance of
我们证明,在 Ni 催化的 Suzuki-Miyaura 交叉偶联反应中,容易获得且工作台稳定的 α-氧代乙烯基砜是有能力的亲电试剂。在这些反应中,α-氧代-乙烯基砜基序中的 C-砜键被化学选择性地裂解,以高产率提供 C-芳基乙二醇或无环乙烯基醚。这些反应在温和的条件下进行,并且可以耐受范围广泛的杂环和官能团。初步的机理研究揭示了 α-杂原子在促进这些转变中的重要性。
Visible-Light Photoredox/Nickel Dual Catalysis for the Cross-Coupling of Sulfinic Acid Salts with Aryl Iodides
An efficient cross-coupling of sodium or lithium sulfinates with aryl iodides, using a combination of nickel and photoredoxcatalysis, is described. The dual catalyst system enables a versatile synthesis of aryl sulfones at roomtemperature in good yields and displays a broad functional group compatibility. The potential utility of this method in the late-stage diversification of complex molecules
Unsymmetrical Diaryl Sulfones through Palladium-Catalyzed Coupling of Aryl Boronic Acids and Arylsulfonyl Chlorides
作者:B. P. Bandgar、Sampada V. Bettigeri、Jaywant Phopase
DOI:10.1021/ol049692c
日期:2004.6.1
[reaction: see text] A simple and efficient method for the synthesis of unsymmetrical diaryl sulfones using the palladium-catalyzedcoupling of aryl boronic acids and arylsulfonyl chlorides has been developed. High product yields, a short reaction time, and mild reaction conditions are important features of this method.
A nickel‐catalyzed cross‐coupling of sodium sulfinates with aryl halides is reported. The reaction provides diaryl sulfones in good yields and displays a broad tolerance towards functional groups.