BINAP-copper supported by hydrotalcite as an efficient catalyst for the borrowing hydrogen reaction and dehydrogenation cyclization under water or solvent-free conditions
作者:Zhaojun Xu、Xiaoli Yu、Xinxin Sang、Dawei Wang
DOI:10.1039/c8gc00557e
日期:——
A BINAP-Cu system supported by hydrotalcite has been developed and proved to be a highlyefficientcatalyst for the atom-efficient and green borrowing hydrogen reaction and dehydrogenative cyclization. This BINAP-Cu complex supported by hydrotalcite is highly air-stable and can be recycled at least five times under solvent-free conditions. Notably, 1-benzyl-2-aryl-1H-benzo[d]imidazole derivatives could
已经开发了由水滑石支撑的BINAP-Cu系统,并被证明是一种高效的催化剂,用于原子效率高的绿色借入氢反应和脱氢环化反应。这种由水滑石负载的BINAP-Cu络合物具有高度的空气稳定性,在无溶剂条件下可以循环至少五次。值得注意的是,第一次以水为溶剂仅一步即可由醇合成1-苄基-2-芳基-1 H-苯并[ d ]咪唑衍生物。这为在水或无溶剂条件下以高收率合成官能化的胺,酮和1-苄基-2-芳基-1 H-苯并[ d ]咪唑衍生物提供了一种更加绿色有效的催化方法。
Ruthenium(II) bis(hydrazone) complexes derived from 1,3,4-oxadiazoles: Synthesis, crystal structure and catalytic application in N-alkylation reactions
1,3,4-Oxadiazoles (A-C) were derived via a series of reactions between isoniazid and salicylaldehydes. While reacting the oxadiazoles with [RuHCl(CO)(PPh3)(3)] in the presence of NaOH, mononuclear ruthenium(II) complexes bearing 'salen' type N,N'-bis(salicylidene) hydrazone ligands (1-3) were obtained. The oxadiazoles and ruthenium(II) complexes were characterized by analytical and spectral methods. The single crystal XRD analyses of complexes 1 and 2 suggested an octahedral geometry around ruthenium(II) ions in which the bis(hydrazone) act as mononegative bidentate ligands. It was also observed that the presence of an intramolecular hydrogen bonding between the hydroxyl proton and one of the azomethine nitrogens in all the complexes. Further, the complexes were proved as versatile catalysts for the N-alkylation of amines with alcohols under optimized reaction conditions. (C) 2015 Elsevier B.V. All rights reserved.
Shanthan Rao; Venkataratnam, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1996, vol. 35, # 11, p. 1199 - 1200