An efficient tandem elimination–cyclization–desulfitative arylation of 2-(gem-dibromovinyl)phenols(thiophenols) with sodium arylsulfinates
作者:Wei Chen、Pinhua Li、Tao Miao、Ling-Guo Meng、Lei Wang
DOI:10.1039/c2ob27232f
日期:——
An efficient tandem eliminationâcyclizationâdesulfitative arylation of 2-(gem-dibromovinyl)phenols(thiophenols) with sodium arylsulfinates has been developed. In the presence of TBAFâPdCl2âCu(OAc)2âNEt3, the reactions generated 2-arylbenzofurans(thiophenes) with good yields in one-pot under ligand-free conditions.
Palladium-Catalyzed Addition of Potassium Aryltrifluoroborates to Aliphatic Nitriles: Synthesis of Alkyl Aryl Ketones, Diketone Compounds, and 2-Arylbenzo[<i>b</i>]furans
developed, leading to a wide range of alkylarylketones with moderate to excellent yields. Moreover, several dinitriles (e.g., malononitrile, glutaronitrile, and adiponitrile) were applicable to this process for the construction of 1,3-, 1,5-, or 1,6-dicarbonyl compounds. The scope of the developed approach is successfully explored toward the one-step synthesis of 2-arylbenzo[b]furans via sequential
已经开发了钯催化的芳基三氟硼酸钾加成到脂肪族腈中的方法,从而产生了范围广泛的烷基芳基酮,并具有中等至极好的收率。此外,几种二腈(例如丙二腈,戊二腈和己二腈)适用于该方法,用于构建1,3-,1,5-或1,6-二羰基化合物。通过顺序加成和分子内环化反应,一步一步合成2-芳基苯并[ b ]呋喃已成功探索了所开发方法的范围。该方法学接受了广泛的底物,并适用于文库合成。
Well‐Defined N‐Heterocyclic Carbene‐Palladium Complexes as Efficient Catalysts for Domino Sonogashira Coupling/Cyclization Reaction and C‐H bond Arylation of Benzothiazole
作者:Seema Yadav、Ajeet Singh、Isha Mishra、Sriparna Ray、Shaikh M. Mobin、Chandrakanta Dash
DOI:10.1002/aoc.4936
日期:2019.7
Well‐defined and air‐stable PEPPSI (Pyridine Enhanced Precatalyst Preparation Stabilization and Initiation) themed palladium bis‐N‐heterocyclic carbene complexes have been developed for the domino Sonogashira coupling/cyclization reaction of 2‐iodophenol with a variety of terminal alkynes and C‐H bond arylation of benzothiazole with aryl iodides. The PEPPSI themed palladium complexes, 2a and 2b were
已经开发出定义明确且空气稳定的PEPPSI(吡啶增强的预催化剂制备稳定和引发)主题的钯双-N-杂环卡宾配合物,用于2-碘代苯酚与各种末端炔烃和C-的多米诺Sonogashira偶联/环化反应。苯并噻唑与芳基碘化物的H键芳基化。通过相应的咪唑鎓盐与PdCl 2和K 2 CO 3的反应,以高收率合成了PEPPSI主题的钯配合物2a和2b。在吡啶中。通过NMR光谱,X射线晶体学,元素分析和质谱研究对新型的空气稳定的钯-NHC络合物进行了表征。以PEPPSI为主题的钯(II)双-N-杂环卡宾配合物2a和2b对2-碘代苯酚与末端炔烃的多米诺Sonogashira偶联/环化反应表现出出色的催化活性,生成苯并呋喃衍生物。此外,钯配合物2a和2b在存在CuI作为助催化剂的情况下,成功地催化了苯并噻唑与芳基碘化物作为偶联伙伴的直接C-H键芳基化。
One-pot Tandem Heck alkynylation/cyclization reactions catalyzed by Bis(Pyrrolyl)pyridine based palladium pincer complexes
作者:Seema Yadav、Chandrakanta Dash
DOI:10.1016/j.tet.2020.131350
日期:2020.7
Ligand assisted palladium catalyzed one-pot tandem Heck alkynylation/cyclization reactions for the synthesis of benzofurans was reported in this paper. Well-defined palladium-pincer complexes exhibited excellent catalytic activities for the one-pot tandem Heck alkynylation/cyclization reactions yielding benzofuran derivatives using 0.1 mol% catalyst. All the catalyticreactions are performed in air
Palladium-catalyzed tandem reaction of 2-hydroxyarylacetonitriles with sodium sulfinates: one-pot synthesis of 2-arylbenzofurans
作者:Jiuxi Chen、Jianjun Li、Weike Su
DOI:10.1039/c4ob00575a
日期:——
Palladium-catalyzed desulfinative addition and intramolecular annulation tandem reactions of 2-hydroxyarylacetonitriles with sodium sulfinates for one-pot synthesis of 2-arylbenzofurans.