One-Pot Catalytic Approach for the Selective Aerobic Synthesis of Imines from Alcohols and Amines Using Efficient Arene Diruthenium(II) Catalysts under Mild Conditions
作者:Sundar Saranya、Rengan Ramesh、Jan Grzegorz Małecki
DOI:10.1002/ejoc.201701408
日期:2017.12.8
A green and efficient catalytic approach for the selective synthesis of imines in air at room temperature was achieved with the aid of newly synthesised diruthenium(II) complexes [(η6-p-cymene)2Ru2Cl2(µ-L)] containing substituted 1,2-diacylhydrazine ligands. All the new complexes were fully characterised by analytical and spectroscopic techniques. The solid-state structure of a representative complex
借助新合成的含有取代 1,2 的二钌 (II) 配合物 [(η6-p-cymene)2Ru2Cl2(μ-L)],实现了一种绿色高效的室温下在空气中选择性合成亚胺的催化方法-二酰基肼配体。通过分析和光谱技术对所有新复合物进行了充分表征。通过单晶 X 射线衍射分析解决了代表性复合物的固态结构。二钌 (II) 配合物还可将醇选择性有氧氧化为醛。催化反应在作为绿色廉价氧化剂的空气存在下进行,并释放出作为唯一副产物的水。提出了亚胺形成的合理机制,据信这是通过醛中间体进行的。
Proline‐Mediated Enantioselective Construction of Tetrahydropyridines<i>via</i>a Cascade Mannich‐Type/Intramolecular Cyclization Reaction
作者:Rong‐Gang Han、Yao Wang、Yu‐Ye Li、Peng‐Fei Xu
DOI:10.1002/adsc.200800253
日期:2008.7.7
A highly diastereo- and enantioselective synthesis of 2,3-disubstituted tetrahydropyridines was accomplished via a proline-mediated cascade Mannich-type/intramolecularcyclizationreaction from preformed N-PMP (p-methoxyphenyl) aldimines and inexpensive aqueous tetrahydro-2H-pyran-2,6-diol.
Asymmetric Petasis Borono‐Mannich Allylation Reactions Catalyzed by Chiral Biphenols
作者:Yao Jiang、Scott E. Schaus
DOI:10.1002/anie.201611332
日期:2017.2
Chiral biphenols catalyze the asymmetric Petasis borono‐Mannich allylation of aldehydes and amines through the use of a bench‐stable allyldioxaborolane. The reaction proceeds via a two‐step, one‐pot process and requires 2–8 mole % of 3,3′‐Ph2‐BINOL as the optimal catalyst. Under microwave heating the reaction affords chiral homoallylic amines in excellent yields (up to 99 %) and high enantioselectivies
Dearomative Photocatalytic Construction of Bridged 1,3‐Diazepanes
作者:Jamie A. Leitch、Tatiana Rogova、Fernanda Duarte、Darren J. Dixon
DOI:10.1002/anie.201914390
日期:2020.3.2
discovery programmes and natural product synthesis. Herein, we report the photocatalytic construction of 2,7-diazabicyclo[3.2.1]octanes (bridged 1,3-diazepanes) via a reductive diversion of the Minisci reaction. The fused tricyclic product is proposed to form via radical addition to the C4 position of 4-substituted quinoline substrates, with subsequent Hantzsch ester-promoted reduction to a dihydropyridine
A general and practical regioselective approach for the C–H amination of 2H-indazoles under transition-metal-free conditions was developed. A series of substrates were tested showing eminent functional group tolerance and affording the C–N functionalization products in good to excellent yields. Mechanism studies revealed that a radical process was involved in this transformation.