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。
Synthesis of salicylaldehydes bearing bulky substituents in the positions 3 and 5
作者:A. I. Kochnev、I. I. Oleynik、I. V. Oleynik、S. S. Ivanchev、G. A. Tolstikov
DOI:10.1007/s11172-007-0170-5
日期:2007.6
4-disubstituted phenols with paraformaldehyde in the presence of SnCl4 and 2,6-lutidine afforded a number of new salicylaldehydes, containing bulky substituents (tert-butyl, 1-phenylethyl, 1-(4-tert-butylphenyl)ethyl, α-cumyl, and trityl) in the positions 3 and 5.
A simple Lewis acid induced reaction of phenols with electrophiles: Synthesis of functionalized 4<i>H</i>-chromenes and <i>ortho</i>-benzylphenols
作者:Chinnabattigalla Sreenivasulu、Ditto Abraham Thadathil、Sumit Pal、Satyanarayana Gedu
DOI:10.1080/00397911.2019.1689268
日期:2020.1.2
Abstract Lewisacid ZnCl2 promoted cyclization protocol to 4H-chromenes is accomplished, using readily available phenols and acetophenones as starting materials. Interestingly, the process is feasible under the solvent free environment. Synthesis of a variety of 4H-chromenes have been accomplished using this strategy. In addition, this concept is extended to the synthesis of ortho-benzylphenols by
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