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Nazarov reagents, cycloadditions

Scheme 7.29 Enantioselective formal [3 + 3] cycloaddition between Nazarov reagents and a,3-unsaturated aldehydes. Scheme 7.29 Enantioselective formal [3 + 3] cycloaddition between Nazarov reagents and a,3-unsaturated aldehydes.
Similar conditions were applied by Gong et al. to the asymmetric formal [3 + 3] cycloaddition of a,p-unsaturated aldehydes with Nazarov reagents bearing an aryl group at C5, which, after oxidation, afforded the corresponding 3,4-dihydropyranones in good yields combined with excellent enantioselectivities of up to 97% ee. The best results are collected in Scheme 6.23. [Pg.186]

Scheme 6.23 Formal [3 + 3] cycloadditions of a,P-unsaturated aldehydes with Nazarov reagents. Scheme 6.23 Formal [3 + 3] cycloadditions of a,P-unsaturated aldehydes with Nazarov reagents.
See other pages where Nazarov reagents, cycloadditions is mentioned: [Pg.417]    [Pg.270]    [Pg.370]    [Pg.271]    [Pg.55]   
See also in sourсe #XX -- [ Pg.271 ]



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