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Michael enantioselective domino

Scheme 2.22. Enantioselective domino Michael/aldol process. Scheme 2.22. Enantioselective domino Michael/aldol process.
Tetrahydroxanthen-l-ones have been obtained through enantioselective domino oxa-Michael - aldol reactions between salicylaldehydes and cyclohexenones using a chiral pyrrolidine catalyst in the presence of 2-nitrobenzoic acid <07TL2181>. A similar approach using chiral 4-hydroxycyclohexenones and V-methylimidazole as catalyst leads to a diastereomeric mixture of the reduced xanthones (Scheme 40) <07S2175>. Dimeric... [Pg.420]

Scheme 7.23 Enantioselective domino Michael/aldol reaction by the Rueping group. Scheme 7.23 Enantioselective domino Michael/aldol reaction by the Rueping group.
Scheme 7.62 Enantioselective domino aza-MBH/intramolecular aza-Michael reaction. Scheme 7.62 Enantioselective domino aza-MBH/intramolecular aza-Michael reaction.
Briere and coworkers gained rapid access to the pyrazolines ring system 300 through a Michael-based domino reaction sequence. This enantioselective process... [Pg.260]

Scheme 8.14 Catalytic enantioselective domino Michael/aldol reaction as developed by Feringa et al. [25]. Scheme 8.14 Catalytic enantioselective domino Michael/aldol reaction as developed by Feringa et al. [25].
A large number of enantioselective domino Michael/intramolecular heterocyclization reactions have been successfully developed in the last years, using three... [Pg.340]

It was based on an enantioselective domino Michael/hemiketalization reaction of ethyl 4,4,4-trifluoroacetoacetate and other trifluoromethyl-substituted nucleophiles with p,y-unsaturated a-ketoesters catalyzed by a chiral quinine-derived thiourea. [Pg.347]

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Michael domino

Michael enantioselective

Michael enantioselectivity

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