Asymmetric synthesis catalyzed by chiral ferrocenylphosphine transition metal complexes. 10 gold(i)-catalyzed asymmetric aldol reaction of isocyanoacetate
作者:Tamio Hayashi、Masaya Sawamura、Yoshihiko Ito
DOI:10.1016/s0040-4020(01)88870-0
日期:1992.1
Optically active ferrocenylbisphosphine ligands containing 2-(dialkylamino)ethylamino group on the ferrocenylmethyl position have been prepared and used for the gold(I)-catalyzed asymmetric aldol reaction of isocyanoacetate with aldehydes. Six-membered ring amines, such as morpholino or piperidino group, at the terminal of the side chain were most stereoselective to give optically active trans-4-
Aldolreaction of ,-dialkyl-α-isocyanoacetamides with primary alkyl aldehydes in the presence of 0.5–1 mol% of a chiral (aminoalkyl) ferrocenylphosphine-gold(I) catalyst proceeded with high enantio- and diastereoselectivity to give trans-5-alkyl-2-oxazoline-4-carboxamides of up to 98.6% ee, which were converted into optically active threo-β-hydroxyamino acids.
Enantioselective Synthesis: Steric and electronic effects of the substrates upon stereoselectivity in the gold(I)-catalyzed aldol reaction with chiral ferrocenylamine ligands, preliminary communication
作者:Antonio Togni、Stephen D. Pastor
DOI:10.1002/hlca.19890720521
日期:1989.8.9
Enantioselectivity in the gold(I)-catalyzed aldol reaction with chiral ferrocenylamine ligands is strongly dependent upon both the steric and electronic effects of the substrates. In the reaction of pyridine-2-, 3-, and 4-carbaldehydes with ethyl 2-isocyanoacetate, surprisingly and significantly different enantioselectivities were observed in the formation of the cis- and trans-dihydro-oxazoles that
Chiral Cooperativity: The Effect of Distant Chiral Centers in Ferrocenylamine Ligands upon Enantioselectivity in the Gold(I)-Catalyzed Aldol Reaction
作者:Stephen D. Pastor、Antonio Togni
DOI:10.1002/hlca.19910740502
日期:1991.8.7
Long-range chiral cooperativity in enantiomerically pure ferrocenylamine ligands containing both planar and multiple centers of chirality (multiple stereogenic C-atoms) was demonstrated in the AuI-catalyzed reaction of aldehydes and isocyanoesters. Synthetic methodology was developed for the synthesis of ferrocenylamine ligands with two and three chiral centers of known absoluteconfiguration in the C-side
A New Family of Cinchona-Derived Amino Phosphine Precatalysts: Application to the Highly Enantio- and Diastereoselective Silver-Catalyzed Isocyanoacetate Aldol Reaction
作者:Filippo Sladojevich、Andrea Trabocchi、Antonio Guarna、Darren J. Dixon
DOI:10.1021/ja110534g
日期:2011.2.16
developed. In combination with Ag(I) salts, these amino-phosphines performed as effective cooperative Brønsted base/Lewis acid catalysts in the asymmetric aldolreaction of isocyanoacetate nucleophiles. Under optimal conditions, high diastereoselectivities (up to 98%) and enantioselectivities (up to 98%) were obtained.