Rhodium-Catalyzed Regio-, Diastereo-, and Enantioselective Three-Component Carboamination of Dienes via C–H Activation
作者:Ruijie Mi、Xuepeng Zhang、Jinlei Wang、Haohua Chen、Yu Lan、Fen Wang、Xingwei Li
DOI:10.1021/acscatal.1c01615
日期:2021.6.4
Reported herein is the rhodium-catalyzed enantioselective three-component coupling of arene, diene, and dioxazolone that occurs via C–H activation en route to allyl intermediate. This carboamination reaction affords chiral allylic amines in 1,2-selectivity, E-selectivity, and enantioselectivity, with electrophilic amination of the π-allyl species being both regio- and enantio-determining.
Highly chemoselective ruthenium(<scp>ii</scp>)-catalyzed direct arylation of cyclic and N,N-dialkyl benzamides with aryl silanes
作者:Pradeep Nareddy、Frank Jordan、Michal Szostak
DOI:10.1039/c7sc00156h
日期:——
first time. This novel protocol enlists challenging cyclic and N,N-dialkyl benzamides as weakly-coordinating substrates to achieve highly regioselective C(sp2)–H arylation as a proof-of-concept, taking advantage of the attractive features of organosilanes as coupling partners. This innovative method is characterized by very high chemoselectivity, installing halide functional groups (I, Br, Cl) that are
SEM, TEM, energy‐dispersive X‐ray spectroscopy, and vibrating‐sample magnetometer techniques. Fe3O4/PDA/CdS was found to be a highly active photocatalyst for the amidation of aromatic aldehydes by using air as a clean oxidant under mild conditions. The photocatalyst can be recovered by magnetic separation and successfully reused for five cycles without considerable loss of its catalytic activity.
磁性CdS量子点(Fe 3 O 4 /聚多巴胺(PDA)/ CdS)通过廉价的起始原料通过便捷的方法合成。通过FTIR光谱,XRD,SEM,TEM,能量色散X射线光谱和振动样品磁力计技术对制得的催化剂进行表征。通过在温和条件下使用空气作为清洁氧化剂,发现Fe 3 O 4 / PDA / CdS是一种高活性的光催化剂,可用于芳族醛的酰胺化。可以通过磁分离回收光催化剂并成功地重复使用五个循环,而不会显着降低其催化活性。
Transition‐Metal‐Free Alkylation/Arylation of Benzoxazole via Tf
<sub>2</sub>
O‐Activated‐Amide
A transition‐metal‐free approach to the alkylation/arylation of benzoxazole was developed by employing Tf2O‐activated‐amide as the alkylating/arylating reagent. The mild reaction conditions, and particularly insensitivity to air and water, further enhance the synthetic potential in pharmaceutical synthesis.