<i>tert</i>-Butyl Nitrite-Mediated Synthesis of <i>N</i>-Nitrosoamides, Carboxylic Acids, Benzocoumarins, and Isocoumarins from Amides
作者:Subhash L. Yedage、Bhalchandra M. Bhanage
DOI:10.1021/acs.joc.7b00570
日期:2017.6.2
(TBN) as a multitask reagent for (1) the controlled synthesis of N-nitrosoamide from N-alkyl amides, (2) hydrolysis of N-methoxyamides to carboxylic acids, (3) metal- and oxidant-free benzocoumarin synthesisfrom ortho-aryl-N-methoxyamides via N–H, C–N, and C–H bond activation, and (4) isocoumarin synthesisusingRu(II)/PEG as a recyclable catalytic system via ortho-C–H activation and TBN as an oxygen source
Ru-Catalyzed Decarboxylative Annulations of α-Keto Acids with Internal Alkynes: Dual Roles of COOH as Directing Group and Leaving Group
作者:Hui Tan、Hongji Li、Jiawang Wang、Lei Wang
DOI:10.1002/chem.201405715
日期:2015.1.26
Carboxylic acid serving as both directing and leavinggroup was discovered in Ru‐catalyzed decarboxylativeannulations of α‐keto acids with alkynes. The well‐established protocol showed high functional group tolerance, which provided an efficient and alternative route to the coumarone backbone.
Decarboxylative [4+2] annulation of arylglyoxylic acids with internal alkynes using the anodic ruthenium catalysis
作者:Mu-Jia Luo、Ting-Ting Zhang、Fang-Jun Cai、Jin-Heng Li、De-Liang He
DOI:10.1039/c9cc03210j
日期:——
A new electrochemical decarboxylative [4+2] annulation of arylglyoxylic acids with internal alkynes involving C–H functionalization by means of a cooperative anode and ruthenium catalysis is presented. This reaction represents a mechanistically novel strategy as an ideal supplement to the decarboxylative [4+2] annulation methodology by employing an electrooxidative process to avoid the use of an additional
提出了一种新的芳基乙醛酸与内部炔烃的电化学脱羧[4 + 2]环合反应,涉及通过协同阳极和钌催化的C–H官能化。通过采用电氧化工艺避免使用额外的外部氧化剂并利用H 2 O作为要结合的羧基氧原子源,该反应代表了一种机械新颖的策略,是脱羧[4 + 2]环化方法的理想补充在合成1 H -isochromen-1-ones中。
Ruthenium(<scp>ii</scp>)-catalyzed electrooxidative [4+2] annulation of benzylic alcohols with internal alkynes: entry to isocoumarins
作者:Mu-Jia Luo、Ming Hu、Ren-Jie Song、De-Liang He、Jin-Heng Li
DOI:10.1039/c8cc08759h
日期:——
A new ruthenium(II)-catalyzed electrooxidative [4+2] annulation of primarybenzylicalcohols with internal alkynes is described, which enables benzylicalcohols as weakly directing group precursors to access isocoumarins via multiple C–H functionalization. The reaction works well with a broad substrate scope, tolerates a wide range of functional groups, and incorporates practically the isocoumarin
Cobalt(III)-Catalyzed Oxidative Annulation of Benzaldehydes with Internal Alkynes via C–H Functionalization in Poly(ethylene glycol)
作者:Li-Ming Tao、Chuan-Hua Li、Jun Chen、Hui Liu
DOI:10.1021/acs.joc.9b00580
日期:2019.6.7
novel Co(III)-catalyzed oxidative annulation of aromatic aldehydes with internal alkynes for accessing isocoumarins is described, which is achieved by oxidation, weak chelation-assisted C–H bond functionalization, and annulation cascades with excellent functional group compatibility, high atom economy, and step efficiency. By using environmentally benign and inexpensive poly(ethyleneglycol)-400 (PEG-400)
描述了一种新型的Co(III)催化的带有内部炔烃的芳香醛与内部炔烃的氧化环化反应,可用于获得异香豆素,该反应是通过氧化,弱螯合辅助的C–H键官能化以及具有出色官能团相容性的环化级联反应实现的,具有高原子经济性,并提高效率。通过使用对环境无害且廉价的聚(乙二醇)-400(PEG-400),可以回收和再利用Co / Cu / PEG-400系统。