Lewis acid-catalyzed nitrone cycloadditions to bidentate and tridentate α,β-unsaturated ketones. High rate acceleration, absolutely endo-selective and regioselective reactions
摘要:
Alpha,beta-unsaturated ketone dipolarophiles having bidentate or tridentate ligand structures, such as (E)-1-benzyloxy- and (E)-1-(2-phenylthioethoxy)-3-penten-2-one, are activated by a Lewis acid catalyst in 1,3-dipolar cycloadditions of nitrones. Dichlorodiisopropoxytitanium and chlorotriisopropoxytitanium are especially effective. Lewis acid-mediated enhancement of stereo- and regioselectivity have been attained for the first time in intermolecular nitrone cycloadditions. Formation of dipolarophile/Lewis acid complexes is responsible for the remarkable Lewis acid catalysis.
Catalytic Asymmetric 1, 3-Dipolar Cycloaddition Reaction of Nitrones with α′-Phosphoric Enones by a Chiral Ligand- Copper(II) Triflate Complex
作者:Kyoung-Chan Lim、Young-Taek Hong、Sunggak Kim
DOI:10.1002/adsc.200700377
日期:2008.2.22
Using the C2-symmetric bis-oxazoline copper(II) catalyst 6f as a chiral Lewis acid, α′-phosphoricenones 2 undergo 1,3-dipolar cycloaddition with nitrones 3 to provide isoxazolidines 4 with very high enantioselectivity and endo/exo selectivity.