Catalytic radical difluoromethoxylation of arenes and heteroarenes
作者:Johnny W. Lee、Weijia Zheng、Cristian A. Morales-Rivera、Peng Liu、Ming-Yu Ngai
DOI:10.1039/c8sc05390a
日期:——
Intermolecular C–H difluoromethoxylation of (hetero)arenes remains a long-standing and unsolved problem in organic synthesis. Herein, we report the first catalytic protocol employing a redox-active difluoromethoxylating reagent 1a and photoredox catalysts for the direct C–H difluoromethoxylation of (hetero)arenes. Our approach is operationally simple, proceeds at room temperature, and uses bench-stable
[EN] DIFLUOROMETHOXYLATION AND TRIFLUOROMETHOXYLATION COMPOSITIONS AND METHODS FOR SYNTHESIZING SAME<br/>[FR] COMPOSITIONS DE DIFLUOROMÉTHOXYLATION ET DE TRIFLUOROMÉTHOXYLATION ET LEURS PROCÉDÉS DE SYNTHÈSE
申请人:UNIV NEW YORK STATE RES FOUND
公开号:WO2019168874A1
公开(公告)日:2019-09-06
The present invention provides a compound having the structure (I), a processing of making the compound; and a process of using the compound as a reagent for the difluoromethoxylation and trifluoromethoxylation of arenes or heteroarenes.
Redox‐Neutral TEMPO Catalysis: Direct Radical (Hetero)Aryl C−H Di‐ and Trifluoromethoxylation
作者:Johnny W. Lee、Sanghyun Lim、Daniel N. Maienshein、Peng Liu、Ming‐Yu Ngai
DOI:10.1002/anie.202009490
日期:2020.11.23
Applications of TEMPO. catalysis for the development of redox‐neutral transformations are rare. Reported here is the first TEMPO.‐catalyzed, redox‐neutralC−Hdi‐ and trifluoromethoxylation of (hetero)arenes. The reaction exhibits a broad substrate scope, has high functional‐group tolerance, and can be employed for the late‐stage functionalization of complex druglike molecules. Kinetic measurements
TEMPO 的应用。氧化还原中性转化发展的催化作用很少见。这里报道的是第一个TEMPO 。(杂)芳烃的催化氧化还原中性 C−H 二氟甲氧基化和三氟甲氧基化。该反应表现出广泛的底物范围,具有较高的官能团耐受性,可用于复杂药物分子的后期功能化。动力学测量、催化中间体的分离和重新研究、UV/Vis 研究和 DFT 计算支持了所提出的氧化 TEMPO 。/TEMPO +氧化还原催化循环。机理研究还表明Li 2 CO 3在防止催化剂失活方面发挥着重要作用。这些发现将为通过氧化还原中性 TEMPO 设计和开发新型反应提供新的见解。催化。
Process for the .alpha.-chlorination of aryl ethers
申请人:Bayer Aktiengesellschaft
公开号:US05440051A1
公开(公告)日:1995-08-08
Aryl ethers are chlorinated in the .alpha.-position by a process in which they are metered into a reaction vessel at the same time as chlorine, the reaction being carried out at temperatures in the range from 60.degree. to 150.degree. C.
Halogenation processes in advantageous solvents, and novel
申请人:Bayer Aktiengesellschaft
公开号:US05484932A1
公开(公告)日:1996-01-16
Compounds such as ##STR1## wherein R is F, CF.sub.3, CF.sub.2 H, CHF CF.sub.3 or CF.sub.2 CF.sub.3, as well as related compounds containing chlorine, are used as solvents in halogenation processes.