Chiral phosphoric acid catalyzed oxidative kinetic resolution of cyclic secondary amine derivatives including tetrahydroquinolines by hydrogen transfer to imines
Chiral phosphoric acid catalyzed oxidative kinetic resolution of cyclic secondary amine derivatives including tetrahydroquinolines by hydrogen transfer to imines
Hydrogenation of ortho-nitrochalcones over Pd/C as a simple access to 2-substituted 1,2,3,4-tetrahydroquinolines
作者:Angela Patti、Sonia Pedotti
DOI:10.1016/j.tet.2010.05.090
日期:2010.7
The preparation of some 2-substituted-1,2,3,4-tetrahydroquinoline has been achieved by the one-pot reductive intramolecular cyclization of ortho-nitrochalcones with gaseous hydrogen in the presence of a Pd/C catalyst and the best selectivity was observed using CH2Cl2 as solvent. The method is operationally simple and versatile since ortho-nitrocalchones are easily accessible by Claisen-Schmidt condensation of 2-nitrobenzaldehydes and enolizable ketones. Selected examples on structurally different substrates have been considered and a novel tetrahydroquinoline and a benzo[h]tetrahydroquinoline were prepared and characterised. (C) 2010 Elsevier Ltd. All rights reserved.
Chiral phosphoric acid catalyzed oxidative kinetic resolution of cyclic secondary amine derivatives including tetrahydroquinolines by hydrogen transfer to imines
The title reaction of tetrahydroquinolines with ketimine in the presence of chiral phosphoric acid proceeded with efficient conversion and excellent enantioselectivities.
四氢喹啉与酮亚胺在手性磷酸存在下的标题反应以高效转化和优异对映选择性进行。
Fluorobissulfonylmethyl Iodides: An Efficient Scaffold for Halogen Bonding Catalysts with an sp<sup>3</sup>-Hybridized Carbon–Iodine Moiety
The halogen-bond donors FBSM-I and FBDT-I, which contain an sp(3)-hybridized carbon iodine (C-sp(3)-I) moiety, were designed and synthesized. The highly electron-withdrawing nature of the fluorobissulfonyl-methane scaffold leads to the generation of sigma-holes on the surface of the iodine atoms in FBSM-I and FBDT-I. Mukaiyama aldol reactions and hydrogen-transfer reductions are efficiently catalyzed by FBSM-I and FBDT-I under neutral and mild reaction conditions. The driving force for these transformations should be the halogen bonding induced by FBSM-I and FBDT-I, which was confirmed by DFT calculations, single crystal X-ray diffraction analyses, and NMR titrations.