ReCl(CO)5-catalyzed cyclocondensation of phenols with 2-methyl-3-butyn-2-ol to afford 2,2-dimethyl-2H-chromenes
作者:Hanxiang Zeng、Jia Ju、Ruimao Hua
DOI:10.1016/j.tetlet.2011.05.093
日期:2011.7
A direct one-pot route for the synthesis of 2,2-dimethyl-2H-chromenes by Re(CO)5Cl-catalyzed cyclocondensation of phenols with 2-methyl-3-butyn-2-ol has been developed. The easy availability of starting materials, mild reaction conditions, high atom-efficiency, and the use of a recoverable catalyst are advantages of this procedure.
Catalysis by β-Cyclodextrin Hydrate - Synthesis of 2,2-Disubstituted 2<i>H</i>
-Chromenes in Aqueous Medium
作者:Avishek Ghatak、Sagar Khan、Sanjay Bhar
DOI:10.1002/adsc.201500358
日期:2016.2.4
well as propargyl ethers with differently substituted phenols under ambient atmosphere in aqueous medium has been developed using β‐cyclodextrin hydrate as an efficient, recyclable and stable catalyst. This is the first report where β‐cyclodextrin hydrate acted as a catalyst for an organic transformation but β‐cyclodextrin alone failed.