已经开发了钯催化的好氧氧化C–H硝化和芳烃与简单易用的亚硝酸叔丁酯(TBN)和甲苯作为自由基前体的酰化反应。分子氧被用作末端氧化剂和氧源以引发活性自由基反应物。在这些新颖的转化中可以使用许多不同的导向基团,例如吡啶,嘧啶,吡唑,吡啶醇,吡啶基酮,肟和偶氮基团。通过自由基过程的Pd II / Pd IV催化循环是这些氧化的CH–H硝化和酰化反应的最可能途径。
Combining Transition Metal Catalysis with Radical Chemistry: Dramatic Acceleration of Palladium-Catalyzed CH Arylation with Diaryliodonium Salts
作者:Sharon R. Neufeldt、Melanie S. Sanford
DOI:10.1002/adsc.201200738
日期:2012.12.14
This paper describes a photoredox palladium/iridium-catalyzed C-H arylation with diaryliodonium reagents. Details of the reaction optimization, substrate scope, and mechanism are presented along with a comparison to a related method in which aryldiazonium salts are used in place of diaryliodonium reagents. The unprecedentedly mild reaction conditions (25 masculineC in methanol), the requirement for
Catalyst-Controlled [3 + 2] and [4 + 2] Annulations of Oximes with Propargyl Alcohols: Divergent Access to Indenamines and Isoquinolines
作者:Wanchun Gong、Zhi Zhou、Jingjing Shi、Bo Wu、Biyun Huang、Wei Yi
DOI:10.1021/acs.orglett.7b03546
日期:2018.1.5
Rhodium(III)- and iridium(III)-catalyzedC–H activation of oximes and coupling with propargyl alcohols is discussed. Depending on the catalyst, the reaction pathway switched between [3 + 2] and [4 + 2] annulations, thus giving divergent access to indenamines and isoquinolines in a one-pot and atom-economical manner. The hydroxyl group in the tertiary propargyl alcohol substrate was found to be crucial
Pd-catalyzed decarboxylative ortho-acylation of O-methyl oximes with phenylglyoxylic acids
作者:Zhiyong Yang、Xiang Chen、Jidan Liu、Qingwen Gui、Kai Xie、Miaomiao Li、Ze Tan
DOI:10.1039/c2cc38861h
日期:——
Aryl ketones were synthesized via Pd-catalyzed decarboxylative coupling between O-methyl oximes and phenylglyoxylic acids using (NH4)2S2O8 as the oxidant.
A mild and efficient Cp*IrIII‐catalyzed (Cp* = pentamethylcyclopentadienyl) ortho‐C(sp2)–Hamidation of O‐methyl ketoximes with sulfonamides is developed and furnishes the corresponding products in good yields.
开发了一种温和有效的Cp * Ir III催化(Cp * =五甲基环戊二烯基)的O-甲基酮肟与磺酰胺酰胺化邻-C(sp 2)-H酰胺,并提供了高收率的相应产品。