已经开发了一种介导的电合成方法用于甲基芳烃的选择性苄基氧化。N-羟基邻苯二甲酰亚胺的质子耦合电化学氧化产生的邻苯二甲酰亚胺-N-氧基(PINO)自由基作为氢原子转移(HAT)介体和原位产生的苄基自由基的自由基陷阱。相对于单电子转移(SET)引发的苄基氧化的直接电解方法,这种介导的电解方法在低得多的阳极电位下运行。将 SET 和介导的 HAT 电解方法与一组常见底物进行直接比较表明,HAT 反应表现出显着改善的底物范围和官能团兼容性。PINOylated产物在光化学条件下很容易转化为相应的苯甲醇或苯甲醛衍生物,并且非甾体抗炎药塞来昔布的后期功能化凸显了该方法的合成实用性。
A ferric nitrate-promoted cross-dehydrogenative coupling reaction of N-hydroxyphthalimide (NHPI) with toluene derivatives is reported. The reaction proceeded smoothly using molecular oxygen as an oxidant, providing an efficient method for the synthesis of N-hydroxyimide esters. Furthermore, a plausible mechanism was proposed.
Nickel-Catalyzed Cross-Coupling of Aryl Redoxactive Esters with Aryl Zinc Reagents
作者:Bo-Hao Shih、R. Sidick Basha、Chin Fa Lee
DOI:10.1021/acscatal.9b02913
日期:2019.10.4
reaction conducted using a redox active ester with aryl zinc reagent was developed. This method demonstrates a new disconnection approach for formation of arylaryl esters. In the one-pot sequential process, the readily available aryl carboxylic acids can be converted into functionalized arylaryl esters and heteroaryl esters. This protocol is amenable to the gram-scale synthesis. The present method
Isonicotinate Ester Catalyzed Decarboxylative Borylation of (Hetero)Aryl and Alkenyl Carboxylic Acids through <i>N</i>-Hydroxyphthalimide Esters
作者:Wan-Min Cheng、Rui Shang、Bin Zhao、Wei-Long Xing、Yao Fu
DOI:10.1021/acs.orglett.7b01950
日期:2017.8.18
Decarboxylative borylation of aryl and alkenyl carboxylic acids with bis(pinacolato)diboron was achieved through N-hydroxyphthalimide esters using tert-butyl isonicotinate as a catalyst under base-free conditions. A variety of aryl carboxylic acids possessing different functional groups and electronic properties can be smoothly converted to aryl boronate esters, including those that are difficult to
N‐Doped Yellow TiO
<sub>2</sub>
Hollow Sphere‐Mediated Visible‐Light‐Driven Efficient Esterification of Alcohol and
<i>N</i>
‐Hydroxyimides to Active Esters
作者:Krishnadipti Singha、Subhash Ch. Ghosh、Asit Baran Panda
DOI:10.1002/asia.201900878
日期:2019.9.16
photocatalyst using aqueous titanium peroxocarbonate complex (TPCC) solution as precursor and NH4 OH. In the developed strategy, the ammonium ion of TPCC and NH4 OH acts as nitrogen source and structure-directing agent. The synthesized N-TiO2 hollow spheres are capable of promoting the synthesis of active esters of N-hydroxyimide and alcohol through simultaneous selective oxidation of alcohol to aldehyde followed