Homogeneous Catalytic Hydrogenation of Amides to Amines
作者:Jacorien Coetzee、Deborah L. Dodds、Jürgen Klankermayer、Sandra Brosinski、Walter Leitner、Alexandra M. Z. Slawin、David J. Cole-Hamilton
DOI:10.1002/chem.201204270
日期:2013.8.12
Hydrogenation of amides in the presence of [Ru(acac)3] (acacH=2,4‐pentanedione), triphos [1,1,1‐tris‐ (diphenylphosphinomethyl)ethane] and methanesulfonic acid (MSA) produces secondary and tertiary amines with selectivities as high as 93 % provided that there is at least one aromatic ring on N. The system is also active for the synthesis of primary amines. In an attempt to probe the role of MSA and
在[Ru(acac)3 ](acacH = 2,4-戊二酮),三[[1,1,1-三(二苯基膦甲基)乙烷]]和甲磺酸(MSA)的存在下进行酰胺加氢生成仲胺和叔胺如果在N上至少有一个芳环,则其选择性高达93%。该系统对伯胺的合成也具有活性。为了探索MSA的作用和反应机理,已经从[Ru(acac)3 ],三醇和MSA或[RuX(OAc)(triphos)]的反应中制备了一系列甲磺酸钠络合物。 (X = H或OAc)或[RuH 2(CO)(triphos )]与MSA。晶体学表征复合物包括:[茹(OAC-κ 1 O)2(H 2O)(triphos)],[Ru(OAc‐κ 2 O,O')(CH 3 SO 3 ‐κ 1 O)(triphos )],[Ru(CH 3 SO 3‐ κ 1 O)2(H 2 O)(三膦)]和[孺2(μ-CH 3 SO 3)3(三磷酸)2 ] [CH 3 SO 3 ],而其他复合物,例如[茹(OAC-κ
Direct One‐Pot Reductive N‐Alkylation of Nitroarenes by using Alcohols with Supported Gold Catalysts
作者:Chun‐Hong Tang、Lin He、Yong‐Mei Liu、Yong Cao、He‐Yong He、Kang‐Nian Fan
DOI:10.1002/chem.201100393
日期:2011.6.20
Gold standard support! The directreductive mono‐ or di‐N‐alkylation of aromatic nitro compounds with alcohols, using a hydrogen‐borrowing strategy, was efficiently promoted by a ligand‐free titania‐supportedgoldcatalyst system (see scheme). A variety of nitroarenes were selectively converted into the corresponding secondary or tertiary amines in good to excellent yields without any co‐catalysts
Selective N-Alkylation of Amines with Alcohols by Using Non-Metal-Based Acid-Base Cooperative Catalysis
作者:Ya Du、Shunsuke Oishi、Susumu Saito
DOI:10.1002/chem.201102446
日期:2011.10.24
straightforward method for the selective N‐mono‐ and dialkylation of amines with alcohols by means of non‐metal‐based catalysis promoted by TAPC is reported (see scheme). Selectivity of the N‐mono‐ and dialkylation, substrate scope and functional‐group tolerance are highlighted with respect to each amine (1° and 2°; aromatic and aliphatic) and alcohol (1°, 2° and 3°; benzylic and aliphatic) component.
and green method for the selectivesynthesis of tertiary amines has been developed that involves iridium-catalyzed alkylation of various primary amines with aromatic or aliphatic alcohols. Notably, the catalytic protocol enables this transformation in the absence of additional base and solvent. Furthermore, the alkylation of nitrobenzene with primary alcohol to tertiary amine has also been achieved by
heterogeneous catalyst – a Co, N and C composite encapsulated carbon nanotube grown in situ on the surface of activated carbon (Co–N–C/CNT@AC) – was fabricated via the pyrolysis–reduction process. Co–N–C/CNT@AC catalyzed the reductive coupling of structurally diverse nitroarenes and alcohols to imines and secondary amines under exogenous base- and solvent-freeconditions. BET, TEM, SEM, XRD and XPS characterization