Chemoselective Reductive Amination of Aldehydes and Ketones by Dibutylchlorotin Hydride-HMPA Complex
作者:Toshihiro Suwa、Erika Sugiyama、Ikuya Shibata、Akio Baba
DOI:10.1055/s-2000-6273
日期:——
Reductive amination of various aldehydes and ketones has been performed effectively by pentacoordinate chloro-substituted tin hydride complex, Bu2SnClH-HMPA. The tin reagent worked particularly well for the case using weakly basic aromatic amines as starting substrates. Stoichiometric amounts of a substrate and a reducingagent were adequate for the reaction. The Sn-Cl bond in the complex plays an
Aldehydes and ketones were reductively aminated by a one‐pot procedure using a recyclable iron‐based Lewis catalyst, Aquivion‐Fe, to promote imine formation, and NaBH4 as reductant in cyclopentyl methyl ether and methanol. The developed protocol was successfully applied to the preparation of Cinacalcet, an important active pharmaceutical ingredient.
Abstract A series of novel [3]ferrocenophane-derived N/BfrustratedLewispairs (FLPs) were synthesized and successfully applied to the catalytic hydrogenation of imines in 71-93% yields. This approach could be easily conducted on gram scale and provided versatile synthetic route for the key intermediate of sertraline hydrochloride without heavy metal residues. Graphical Abstract
Simple, efficient and reusable Pd–NHC catalysts for hydroamination
作者:Qian Chen、Lanlan Lv、Meng Yu、Yanhui Shi、Yuling Li、Guangsheng Pang、Changsheng Cao
DOI:10.1039/c3ra42990c
日期:——
series of chelating NHC–palladium complexes with different alkane-bridges of the type Pd[NHC–(CH2)n–NHC]X2 (X = Br or Cl, n = 2–4) were synthesized, where NHC is a triazolyl-N-heterocyclic carbene donor ligand. The bromide complexes with n = 2 and 3 were characterized by X-ray crystallography. The effects of the length of the bridge and halide ligand on the catalytic reactivity in the hydroamination reaction
substitution. In the solidstate deactivation is effectively suppressed and the active frustrated phosphane/borane Lewis pair splits dihydrogen or adds to sulfur dioxide. A variety of phosphane/B(C6F5)3 pairs have been used to carry out active FLP reactions in the solidstate. The reactions were analyzed by DFT calculations and by solidstate NMR spectroscopy. The solidstate dihydrogen splitting reaction
在溶液中,PCy 3 / B(C 6 F 5)3对通过亲核芳族取代迅速失活。在固态状态下,失活得到有效抑制,活性受阻的膦/硼烷路易斯对分解二氢或添加到二氧化硫中。各种膦/ B(C 6 F 5)3对已用于在固态下进行活性FLP反应。通过DFT计算和固态NMR光谱分析反应。固态二氢裂解反应也在接近室温的条件下进行,其中非猝灭的膦/硼烷混合物悬浮在含氟液体全氟甲基环己烷中。