Ni-Catalyzed Electrochemical Decarboxylative C–C Couplings in Batch and Continuous Flow
作者:Hui Li、Christopher P. Breen、Hyowon Seo、Timothy F. Jamison、Yuan-Qing Fang、Matthew M. Bio
DOI:10.1021/acs.orglett.8b00070
日期:2018.3.2
An electrochemically driven, nickel-catalyzed reductive coupling of N-hydroxyphthalimide esters with aryl halides is reported. The reaction proceeds under mild conditions in a divided electrochemical cell and employs a tertiaryamine as the reductant. This decarboxylative C(sp3)-C(sp2) bond-forming transformation exhibits excellent substrate generality and functional group compatibility. An operationally
Ru-Photoredox-Catalyzed Decarboxylative Oxygenation of Aliphatic Carboxylic Acids through <i>N</i>-(acyloxy)phthalimide
作者:Chao Zheng、Yuting Wang、Yangrui Xu、Zhen Chen、Guangying Chen、Steven H. Liang
DOI:10.1021/acs.orglett.8b01885
日期:2018.8.17
yl)oxyl (TEMPO) in the presence of rutheniumphotoredoxcatalysis is reported. The key transformation entails a highly efficient photoredox catalytic cycle using Hantzsch ester as a reductant. The ensuing alkoxyamine can be readily converted to the corresponding alcohol in one pot, representing an alternative approach to access aliphatic alcohols under photoredox conditions.
Catalyst‐Free Decarboxylation of Carboxylic Acids and Deoxygenation of Alcohols by Electro‐Induced Radical Formation
作者:Xiaoping Chen、Xiaosheng Luo、Xiao Peng、Jiaojiao Guo、Jiantao Zai、Ping Wang
DOI:10.1002/chem.201905224
日期:2020.3.12
derived from naturally abundant carboxylic acids and alcohols provides a sustainable and inexpensive approach to radical formation via undivided electrochemical cells. The resulting radicals are trapped by an electron-poor olefin or hydrogen atom source to furnish the Giese reaction or reductive decarboxylation products, respectively. A broad range of carboxylic acid (1°, 2°, and 3°) and alcohol (2° and
Photoredox-mediated C–H bond alkylation of 6-aryl-2,2′-bipyridines with N-(acyloxy)phthalimides is reported. The reaction exhibits excellent functional group tolerance, including chiral aliphatic groups. The influence of the incorporated C6′-alkyl group on the photophysical properties of the corresponding (N^N^C) cyclometalated Pt(II) complexes is described, including chiroptical properties.
据报道,光氧化还原介导的6-芳基-2,2'-联吡啶与N-(酰氧基)邻苯二甲酰亚胺的CH键烷基化。该反应显示出优异的官能团耐受性,包括手性脂族基团。描述了结合的C 6'-烷基对相应的(N ^ N ^ C)环金属化的Pt(II)配合物的光物理性质的影响,包括手性。
Photoredox-Catalysed Decarboxylative Alkylation of N-Heteroarenes with <i>N</i>
-(Acyloxy)phthalimides
作者:Wan-Min Cheng、Rui Shang、Ming-Chen Fu、Yao Fu
DOI:10.1002/chem.201605640
日期:2017.2.21
catalyst in combination with either a stoichiometric amount of Brønsted acid or a catalytic amount of Lewis acid is capable of catalyzingregioselective alkylation of N‐heteroarenes with N‐(acyloxy)phthalimides at room temperature under irradiation. A broad range of N‐heteroarenes can be alkylated using a variety of secondary, tertiary, and quaternary carboxylates. Mechanistic studies suggest that an IrII/IrIII
铱光氧化还原催化剂与化学计量的布朗斯台德酸或催化量的路易斯酸结合使用,能够在室温下于辐射下催化N-(酰氧基)邻苯二甲酰亚胺对N-杂芳烃的区域选择性烷基化。可以使用各种仲,叔和季羧酸盐将多种N-杂芳烃烷基化。机理研究表明,Ir II / Ir III氧化还原催化循环是所观察到的反应性的原因。