is one of the most attractive catalysts, especially for aromatic C–H functionalizations. However, stoichiometric amounts of oxidants and strong carbanions are required, and C–H tertiary alkylation, especially with electron-deficient alkylgroups, is unexplored. In this paper, we describe the development of iron-catalyzed selective C–H tertiary alkylations with heteroaromatics, in which an iron salt
Different Behaviors of a Cu Catalyst in Amine Solvents: Controlling N and O Reactivities of Amide
作者:Yu Yamane、Koichiro Miyazaki、Takashi Nishikata
DOI:10.1021/acscatal.6b02309
日期:2016.11.4
Controlling the reactivity of the nitrogen or oxygen nucleophile of an amide group to form C–N or C–O bonds by tuning reaction conditions is one of the most challenging issues in the use of amides in organic synthesis. Both nucleophiles in the amide group can individually participate in reactions, and most reactions employ a substrate-controlled methodology to achieve selectivity. However, in the reaction
Copper-Catalyzed Functionalized Tertiary-Alkylative Sonogashira Type Couplings via Copper Acetylide at Room Temperature
作者:Yu Yamane、Naoki Miwa、Takashi Nishikata
DOI:10.1021/acscatal.7b02615
日期:2017.10.6
several reports on Sonogashira couplings, but most of the reported reactions have employed aryl or alkenyl halides as coupling partners. Therefore, Sonogashira coupling is unsuitable for alkyl loadings, especially tertiary alkyl groups. In this research, we found that a copper catalyst is effective for a reaction between a terminal alkyne and an α-bromocarbonyl compound to form a quaternary carbon having
Synthesis and biological evaluation of Esaprazole analogues showing σ1 binding and neuroprotective properties in vitro
作者:Nicholas M. Kelly、Anja Wellejus、Heidi Elbrønd-Bek、Morten Sloth Weidner、Signe Humle Jørgensen
DOI:10.1016/j.bmc.2013.02.058
日期:2013.6
surprisingly discovered to have neuroprotectiveactivities and σ1 binding in vitro. A highly diverse set of Esaprazole analogues 2–5 was prepared in order to increase blood–brain barrier penetration. The analogues showed a structure–activity relationship at the σ1 receptor closely matching already published pharmacophores. Many of the analogues were shown to have neuroprotectiveproperties in two assays using
There are several reports of lactam cyclizations, but most yield less-substituted lactam rings. Therefore, diastereoselective cyclization to yield highly substituted lactams is one of the challenges in this field. We therefore propose a strategy involving the reactions of α-halocarboxamides with E/Z-mixed internal olefins here. An Fe/triphos catalyst system is effective in reactions between α-bromocarboxamides