Room Temperature Catalyst System for the Hydroarylation of Olefins
作者:Siu Yin Lee、Alexander Villani-Gale、Chad C. Eichman
DOI:10.1021/acs.orglett.6b02492
日期:2016.10.7
A simple protocol for the hydroarylation of olefins to yield diarylmethine products is described. A Friedel–Crafts-type synthetic strategy allows direct access to biorelevant products in high atom efficiency. A combination of substoichiometric amounts of TMSCl and ZnBr2 promotes a rapid hydroarylation process at ambient temperature. The method is high yielding and is amenable to scale-up protocols
A H3PO3-catalyzed alkylation of phenols with alkenes is achieved in a facile, efficient, and selective manner. The reaction shows a unique selectivity, i.e., excellent regioselectivity, thorough suppression of overalkylation, without alkylation of a simple phenyl ring, and can selectively provide ortho-, meta-, or para-alkylated phenol derivatives in good to excellent yields. This feature along with
AH 3 PO 3催化的苯酚与烯烃的烷基化反应以简便,有效和选择性的方式实现。该反应显示出独特的选择性,即优异的区域选择性,彻底抑制了过度烷基化,而没有简单的苯环烷基化,并且可以有选择地提供邻位,间位或对位烷基化的苯酚衍生物,收率良好至优异。此功能以及温和的反应条件,敏感的官能团耐受性以及酚类生物活性化合物的按比例放大合成和后期修饰,使其成为酚类修饰的理想且实用的替代品。
3D Nanoporous FeAl-KIT-5 with a cage type pore structure: a highly efficient and stable catalyst for hydroarylation of styrene and arylacetylenes
作者:Shaji Varghese、Samuthira Nagarajan、Mercy R. Benzigar、Ajayan Mano、Zeid A. ALOthman、George Allen Gnana Raj、Ajayan Vinu
DOI:10.1016/j.tetlet.2012.01.040
日期:2012.3
A novel bimetallic nanoporous FeAl-KIT-5 catalyst with a cage type porous structure and a high surface area has been prepared for the hydroarylation of styrene and arylacetylenes to afford 1,1-diarylalkanes and 1,1-diarylalkenes, respectively. The catalyst was found to be highly active, and selective, affording a high yield of substituted alkanes and alkenes. The catalyst also showed much higher activity
A process for preparing acyloxybenzenesulfonates by reacting a carboxylic acid derivative with a salt of a phenolsulfonic acid in the presence of an antioxidant, preferably 2,6-di-tert-butyl-4-methylphenol. The addition of such antioxidants gives a product having a high color quality.
作者:Qingyu Zhang、Yung‐Yin Chan、Muyin Zhang、Ying‐Yeung Yeung、Zhihai Ke
DOI:10.1002/anie.202208009
日期:2022.8.26
strategy for hypervalentchalcogenonium⋅⋅⋅πbondingcatalysis using trisubstituted selenonium salts as electrophilic chalcogen bond donors and alkenes as chalcogen bond acceptors is reported. 1,2-Oxaselenoliums can activate π-systems in three classes of metal-free cyclization and addition via unconventional seleniranium intermediates. The counter anion has a significant effect on catalysis.