A novel method for the synthesis of β-nitrate ester carboxamides using non-corrosive tert-butyl nitrite (TBN) as the nitro source and easily available oxygen as the oxidant has been developed. Variously substituted 2-oxazolines were efficiently ring-opened to deliver the corresponding products in excellent yields. Notably, this reaction provides fast access to pharmaceuticals such as nicorandil.
Single-Component Phosphinous Acid Ruthenium(II) Catalysts for Versatile C−H Activation by Metal-Ligand Cooperation
作者:Daniel Zell、Svenja Warratz、Dmitri Gelman、Simon J. Garden、Lutz Ackermann
DOI:10.1002/chem.201504851
日期:2016.1.22
Well‐defined ruthenium(II) phosphinousacid (PA) complexes enabled chemo‐, site‐, and diastereoselective C−H functionalization of arenes and alkenes with ample scope. The outstanding catalytic activity was reflected by catalyst loadings as low as 0.75 mol %, and the most step‐economical access reported to date to angiotensin II receptor antagonist blockbuster drugs. Mechanistic studies indicated a
A Convenient Synthesis of 2-Oxazolines and 2-Benoxazoles with PPh3-DDQ as the Dehydrating Reagent
作者:Quancai Xu、Zhengning Li、Huiying Chen
DOI:10.1002/cjoc.201190190
日期:2011.5
2‐benoxazoles were synthesized in high yields from acylamino alcohols and acylamino‐ phenols, respectively, with triphenylphosphine‐2,3‐dichloro‐5,6‐dicyanobenzoquinone (PPh3‐DDQ) as the dehydrating and activating reagent. The synthesis was accomplished under neutral conditions.
Rhodium(III)-Catalyzed Oxidative Cyclization of Oxazolines with Cyclopropanols: Synthesis of Isoindolinones
作者:Jidan Liu、Zhenke Yang、Jinyuan Jiang、Qiaohai Zeng、Liyao Zheng、Zhao-Qing Liu
DOI:10.1021/acs.orglett.1c02031
日期:2021.8.6
The synthesis of C3-substituted isoindolin-1-ones from oxazolines and cyclopropanols has been achieved with oxazoline as a bifunctional nucleophilic directing group. The reaction proceeds by the cleavage of three chemical bonds and allows the formation of three new chemical bonds, a C–N bond, a C–C bond, and a C–O bond, in a single step.
Ruthenium(II) Acetate Catalyzed Synthesis of Silylated Oxazoles via C–H Silylation and Dehalogenation
作者:Shun Liu、Shiling Zhang、Qiao Lin、Yiqi Huang、Bin Li
DOI:10.1021/acs.orglett.9b00085
日期:2019.2.15
efficient ruthenium(II)-catalyzed intermolecular selective ortho C–H silylation of 2-aryloxazoles has been described for the first time, which provides a convenient and practical pathway for the synthesis of versatile organosilane compounds with good functional group tolerance and regioselectivity. This catalytic system could be also applied to the dehalogenation of Cl or Br group.