Cinchona alkaloid derived ligands in catalytic asymmetric transfer hydrogenation
作者:Antti Hartikka、Stefan A. Modin、Pher G. Andersson、Per I. Arvidsson
DOI:10.1039/b304060g
日期:——
A collection of chiral quinuclidine ligands, derived from the Cinchona alkaloids quinine and quinidine, has been evaluated in the catalyticasymmetrictransferhydrogenation of aromatic ketones. It was fond that [IrCl(COD)]2 complexes of the diamines QCI-Amine and QCD-Amine gave the most active catalysts, capable of reducing a range of aromatic ketones with excellent conversions and good enantioselectivities
New hydrogenated and didehydrogenated 1,2-diamines of quincorine and quincoridine
作者:Ion Neda、Thomas Kaukorat、Christian Hrib
DOI:10.1016/s0957-4166(02)00320-8
日期:2002.7
Four new members of the family of 1,2-diamines of quincorine and quincoridine have been synthesized, being hydrogenated and didehydrogenated at the C10-C11 fragment. The alkynes, containing an additional amino group at C9, are potentially useful building blocks for cross-coupling reactions. Additional investigations concerning the chemical properties of the molecules point to a significant impact of the remote C5 substituent on the basicity of the bridgehead nitrogen. (C) 2002 Elsevier Science Ltd. All rights reserved.
Unusual Stabilization of 1,2-Diamino Derivatives of Quincorine and Quincoridine by Carbon Dioxide: Persistent Crystallineprim-Ammonium-Carbamate Salts and Their Reactivity towards Isatoic Acid Anhydride
作者:Ion Neda、Thomas Kaukorat、Axel K. Fischer
DOI:10.1002/ejoc.200300211
日期:2003.10
2-aminomethyl derivatives of QCI and QCD on their basicity and polarity and, therefore, on their reactivity towards isatoic acid anhydride. By exposing a number of 2-aminomethyl derivatives of QCI and QCD to (carbon dioxide from) air, the formation of carbon dioxide adducts 10−15 was observed. In an unusual reaction, we obtained the first set of chiral ammonium carbamates derived from primary amines,