Chiral iminopyridines obtained by reaction between a variety of chiral amines and pyridyl aldehydes or ketones were assessed as catalysts in the enantioselectiveHenryreaction between nitromethane and 2-methoxybenzaldehyde in the presence of copper(II) acetate. 1-(2-Methoxyphenyl)-2-nitroethanol was obtained in moderate yields and good enantioselectivities (up to 82% ee) under straightforward experimental
Chiral 8-amino substituted 2-phenyl-5,6,7,8-tetrahydro-6,6-dimethylmethanoquinolines as chiral ligands for enantioselective catalysis: palladium catalysed allylic substitution and addition of diethylzinc to benzaldehyde
作者:Giorgio Chelucci、Gerard A. Pinna、Antonio Saba
DOI:10.1016/s0957-4166(97)00275-9
日期:1997.8
Diastereomerically pure 8-amino substituted (5S,7S)-2-phenyl-5,6,7,8-tetrahydro-6,6-dimethylmethanoquinolines were prepared and assessed in the enantioselective palladiumcatalysedallylic substitution of 1,3-diphenylprop-2-enyl acetate with dimethyl malonate and addition of diethylzinc to benzaldehyde. Enantioselectivities up to 68% were obtained.
A pineno-salen type catalyst for the enantioselective Nozaki–Hiyama–Kishi reaction
作者:Attrimuni P. Dhondge、Ajam C. Shaikh、Chinpiao Chen
DOI:10.1016/j.tetasy.2012.05.012
日期:2012.5
A new class of pineno-salen type ligands 10, 11, 17, 20, 23, and 24 has been developed. The catalyst formed from chromium(II)-10 promotes the enantioselective Nozaki-Hiyama-Kishi allylation of alkyl and aryl aldehydes using allyl bromide. Notably, the asymmetric addition of vinyl halide to benzaldehyde was achieved with 24% ee. (C) 2012 Elsevier Ltd. All rights reserved.
New monoterpene-derived phosphinopyridine ligands and their application in the enantioselective iridium-catalyzed hydrogenation
作者:Giorgio Chelucci、Mauro Marchetti、Andrei V. Malkov、Frédéric Friscourt、Martin E. Swarbrick、Pavel Kočovský
DOI:10.1016/j.tet.2011.05.075
日期:2011.7
derivatives with a phosphine or phosphinite pendant (1–11) have been synthesized from (+)-α-pinene, (−)-isopinocampheol, and/or (+)-camphor via Kröhnke annulation or another annulation method as the key step for the construction of the pyridine nucleus. The iridium complex of 6 proved to catalyzehydrogenation of the prochiral unfunctionalized alkene 44 with 94% ee, whereas the complex of 2 was most efficient