Isomerization of Terminal Epoxides by a [Pd–H] Catalyst: A Combined Experimental and Theoretical Mechanistic Study
摘要:
An unusual palladium hydride complex has been shown to be a competent catalyst in the isomerization of a variety of terminal and internal epoxides. The reaction displayed broad scope and synthetic utility. Experimental and theoretical evidence are provided for an unprecedented hydride mechanism characterized by two distinct enantio-determining steps. These results hold promise for the development of an enantioselective variant of the reaction.
The isomerization of epoxides to aldehydes using the readily available Crabtree's reagent is described. The aldehydes were transformed into synthetically useful amines by a one‐pot reductive amination using pyrrolidine as imine‐formation catalyst. The reactions worked with low catalyst loadings in very mild conditions. The procedure is operationally simple and tolerates a wide range of functional groups
Novel 2-[4-(3-methyl-2-thienyl)phenyl]propionic acid and
申请人:Toyama Chemical Co., Ltd.
公开号:US04230719A1
公开(公告)日:1980-10-28
A novel 2-[4-(3-methyl-2-thienyl)phenyl]propionic acid and a pharmaceutically acceptable salt thereof. These compounds are useful for treating symptoms of inflammation and pain in mammals including man. This disclosure relates to such compounds, a process for producing the same, a pharmaceutical composition containing such a compound and a method for treating symptoms of inflammation and pain.
Taking advantage of lithium monohalocarbenoid intrinsic α-elimination in 2-MeTHF: controlled epoxide ring-opening <i>en route</i> to halohydrins
作者:Laura Ielo、Margherita Miele、Veronica Pillari、Raffaele Senatore、Salvatore Mirabile、Rosaria Gitto、Wolfgang Holzer、Andrés R. Alcántara、Vittorio Pace
DOI:10.1039/d0ob02407d
日期:——
The intrinsic degradative α-elimination of Li carbenoids somehow complicates their use in synthesis as C1-synthons. Nevertheless, we herein report how boosting such an α-elimination is a straightforward strategy for accomplishing controlled ring-opening of epoxides to furnish the corresponding β-halohydrins. Crucial for the development of the method is the use of the eco-friendly solvent 2-MeTHF, which