Graphite-Supported Gold Nanoparticles as Efficient Catalyst for Aerobic Oxidation of Benzylic Amines to Imines and<i>N</i>-Substituted 1,2,3,4-Tetrahydroisoquinolines to Amides: Synthetic Applications and Mechanistic Study
作者:Man-Ho So、Yungen Liu、Chi-Ming Ho、Chi-Ming Che
DOI:10.1002/asia.200900261
日期:2009.10.5
of N‐substituted 1,2,3,4‐tetrahydroisoquinolines in the presence of aqueous NaHCO3 solution gave the corresponding amides in good yields (83–93 %) with high selectivity (up to amide/enamide=93:4) (6 examples). The same protocol can be applied to the synthesis of benzimidazoles from the reaction of o‐phenylenediamines with benzaldehydes under aerobic conditions (8 examples). By simple centrifugation
使用氧气作为末端氧化剂对胺进行选择性氧化是绿色化学中的重要领域。在这项工作中,我们描述了使用石墨负载的金纳米颗粒(AuNPs / C)催化环状和非环状苄胺的好氧氧化为相应的亚胺,具有中等至优异的底物转化率(43-100%)和产品收率(66–99%)(19个例子)。在NaHCO 3水溶液存在下,对N-取代的1,2,3,4-四氢异喹啉进行氧化,得到的酰胺产率高(83-93%),选择性高(酰胺/酰胺= 93:4)( 6个示例)。相同的协议可以从反应被施加到苯并咪唑的合成Ò在好氧条件下将苯二胺与苯甲醛一起使用(8个例子)。通过简单的离心,可以回收AuNPs / C并重复使用十次,以将二苄基胺氧化为N-亚苄基(苯基)甲胺,而不会显着降低催化活性和选择性。可以将协议“ AuNPs / C + O 2 ”调整为克级,通过氧化10 g 1,2,3,4-可以得到8.9 g(84%分离出的产率)3,4-二氢异
Aerobic oxidative coupling of alcohols and amines towards imine formation by a dicopper(I,I) catalyst
作者:Indranil Dutta、Subhabrata De、Sudhir Yadav、Ranajit Mondol、Jitendra K. Bera
DOI:10.1016/j.jorganchem.2017.05.009
日期:2017.11
A dicopper(I,I) complex [Cu2(L1) (Cl)2] (1), bearing a Cu2Cl2 core spanned by a naphthyridine–diimine ligand is synthesized by the treatment of CuCl with 2,7–bis(N–mesitylmethylimino)–1,8–naphthyridine (L1). The catalytic efficacy of 1 is assessed for aerobic oxidative synthesis of imines from alcohols and amines. The title complex is found to be an excellent catalyst for a wide variety of alcohols
Manganese(III) Porphyrin‐Catalyzed Dehydrogenation of Alcohols to form Imines, Tertiary Amines and Quinolines
作者:Kobra Azizi、Sedigheh Akrami、Robert Madsen
DOI:10.1002/chem.201900737
日期:2019.5.2
Manganese(III) porphyrin chloride complexes have been developed for the first time as catalysts for the acceptorless dehydrogenative coupling of alcohols and amines. The reaction has been applied to the direct synthesis of imines, tertiary amines and quinolines where only hydrogen gas and/or water are formed as the by‐product(s). The mechanism is believed to involve the formation of a manganese(III) alkoxide
Vanadium- and Chromium-Catalyzed Dehydrogenative Synthesis of Imines from Alcohols and Amines
作者:Yulong Miao、Simone V. Samuelsen、Robert Madsen
DOI:10.1021/acs.organomet.1c00123
日期:2021.5.10
Vanadium(IV) tetraphenylporphyrin dichloride and chromium(III) tetraphenylporphyrin chloride have been developed as catalysts for the acceptorless dehydrogenation of alcohols. The catalysts have been applied to the direct synthesis of imines in overall good yields from a variety of alcohols and amines. The transformations are proposed to proceed by metal–ligand bifunctional pathways with an outer-sphere
Molybdenum-Catalyzed Dehydrogenative Synthesis of Imines from Alcohols and Amines
作者:Kobra Azizi、Robert Madsen
DOI:10.1002/cctc.201800677
日期:2018.9.7
synthesis of imines from primary alcohols and amines with the liberation of dihydrogen. The catalyst is generated in situ from molybdenum hexacarbonyl, 1,3‐dicyclohexylimidazolium chloride and potassium tert‐butoxide and is further stabilized by the phosphine ligand dppe. Imines are formed in moderate to good isolated yields and a variety of alcohols and amines can be employed in the reaction including anilines