Lead-Catalyzed Synthesis of Azo Compounds by Ammonium Acetate Reduction of Aromatic Nitro Compounds
作者:G. R. Srinivasa、K. Abiraj、D. Channe Gowda
DOI:10.1081/scc-120026850
日期:2003.12.31
Lead/ammonium acetate is a convenient reagent for the reduction of aromaticnitrocompounds to the corresponding symmetrically substituted azo compounds. Various azo compounds containing additional reducible substituents such as halogen, nitrile, acid, phenol, ester, methoxy, etc., functions have been synthesized in a single step by the use of this reagent. The conversion is reasonably fast, clean,
The invention relates to a method for producing urethanes or ureas or mixtures of urethanes and ureas by oxidative carbonylation of organic amines in the presence of carbon monoxide, oxygen and a catalyst, where the catalyst used is a transition metal complex containing the structural feature: [Mn+(O˜N˜O)2−](n-2)+(L)m(Z−)n-2 and the method is carried out under halogen-free reaction conditions. The invention further relates to transition metal complexes containing said structural feature and also to the use of such transition metal complexes as catalysts in the production of urethanes or ureas or mixtures of urethanes and ureas.
A New Portal to SuFEx Click Chemistry: A Stable Fluorosulfuryl Imidazolium Salt Emerging as an “F−SO<sub>2</sub>
+” Donor of Unprecedented Reactivity, Selectivity, and Scope
作者:Taijie Guo、Genyi Meng、Xiongjie Zhan、Qian Yang、Tiancheng Ma、Long Xu、K. Barry Sharpless、Jiajia Dong
DOI:10.1002/anie.201712429
日期:2018.3.1
in highly functional molecules. We now report that a solid fluorosulfuryl imidazolium triflate salt delivers the same “F−SO2+” fragment to Nu−H acceptor groups in the substrates. However, this triflate salt is a far more reactive fluorosulfurylating agent than SO2F2 and displays selectivity preferences of its own. Moreover, the new azolium triflate reagent reacts once with primary amines and anilines
已经发现,硫酰氟SO 2 F 2在各种环境中,甚至在高功能分子中,都可以使苯酚衍生化。现在,我们报告固体三氟甲磺酸氟磺酰基咪唑鎓盐向底物中的Nu-H受体基团传递相同的“ F-SO 2 + ”片段。但是,这种三氟甲磺酸盐是一种比SO 2 F 2更具活性的氟磺化剂,并显示出其自身的选择性偏好。而且,在停止反应之前,新的三氟甲磺酸偶氮鎓试剂与伯胺和苯胺反应一次。另一方面,用三乙胺和两当量的“ F-SO 2 +“供体存在,它以良好的收率继续进行双(氟硫磺酰基)酰亚胺的转化-这是我们从未见过的两个重要的转化反应,我们将磺酰氟用作亲电试剂。
Nitric oxide donating derivatives for the treatment of cardiovascular disorders
申请人:Tucker Joseph
公开号:US20050080024A1
公开(公告)日:2005-04-14
Compounds comprising nitric oxide derivatives of stilbenes, polyphenols and flavonoids and methods of their use are provided for treating patients suffering from any of hypercholesterolemia, vascular oxidative stress and endothelial dysfunction.