Dearomatization‐Rearomatization Strategy for
<i>ortho</i>
‐Selective Alkylation of Phenols with Primary Alcohols
作者:Jianjin Yu、Chao‐Jun Li、Huiying Zeng
DOI:10.1002/anie.202010845
日期:2021.2.19
the synthesis of site‐specificallysubstituted phenols is challenging, and thus the development of new methods for this purpose would be highly desirable. Reported here is a protocol for palladium‐catalyzed ortho‐selective alkylation reactions of phenols with primary alcohols by a dearomatization‐rearomatization strategy, with water as the sole by‐product. Various substituted phenols and primary alcohols
Bulky diarylammonium arenesulfonates as mild and extremely active dehydrative ester condensation catalysts
作者:Akira Sakakura、Shoko Nakagawa、Kazuaki Ishihara
DOI:10.1016/j.tet.2005.09.059
日期:2006.1
especially large-scale, fundamental reactions like estercondensations, are highly desirable for many reactions. Bulky diarylammonium pentafluorobenzenesulfonates and tosylates serve as extremely active dehydration catalysts for the estercondensation reaction of carboxylicacids with equimolaramounts of sterically demanding alcohols and acid-sensitive alcohols. Typically, the esterification reaction is performed
Bulky Diarylammonium Arenesulfonates as Selective Esterification Catalysts
作者:Kazuaki Ishihara、Shoko Nakagawa、Akira Sakakura
DOI:10.1021/ja050223v
日期:2005.3.1
large-scale, fundamental reactions such as estercondensations, are highly desirable for many reactions. Bulky diarylammonium pentafluorobenzenesulfonates and tosylates serve as extremely active dehydration catalysts for the estercondensation reaction of carboxylicacids with equimolaramounts of sterically demanding alcohols and acid-sensitive alcohols. Typically, the esterification reaction is performed
The conversion of esters and ketones into easily dehydrated α-silylated alcohols, and protodesilylation of the resultant vinylsilanes, gives alkenes under relatively mild acidic conditions.
Estercondensation is one among the most fundamental organic transformations, and more environmentally benign alternatives to current esterification processes are needed. Under solvent-free and drying agent-free conditions, catalytic amounts of sulfonic acids promote estercondensationbetween an equimolar mixture of carboxylicacids and alcohols. In particular, p-toluenesulfonic acid (TsOH) and 10-camphorsulfonic