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An unprecedented organocatalytic asymmetric Michael/Hemiketalization/retro-aldol cascade sequence catalyzed by bifunctional amino-squaramides is described. The corresponding adducts were generally obtained in high yields (up to 97%) with moderate diastereo- (up to 79:21 dr) and good enantioselectivities (up to 90% ee). [ABSTRACT FROM AUTHOR]

The first organocatalytic asymmetric sequential allylic alkylation–cyclization of Morita–Baylis–Hillman carbonates and 3-hydroxyoxindoles has been developed to afford spirooxindoles bearing α-methylene-γ-butyrolactone motifs in 25–85% yield, 60–94% ee and up to ＞20 : 1 diastereoselectivity. [ABSTRACT FROM AUTHOR]

The article presents chemical equations related to the article organocatalytic asymmetric cascade with Michael, Hemiketalization & Retro-Aldol reaction of 3-acetyl-oxindole with unsaturated ketoesters by amino-squaramides by J. Zhou & others, appeared in a 2014 issue of journal "Tetrahedron."

The article presents chemical equations related to the article "Efficient Asymmetric Michael Reaction of 2-Oxindole-3-carboxylate Esters with Maleimides Catalyzed by Cinchonidine" by J. Zhou and others, published in the periodical "Tetrahedron" in 2014.

Abstract: Organocatalytic Michael–aldol–dehydration domino reaction of 3-(1-hydroxyethylidene)benzofuran-2(3H)-ones and enones catalyzed by Cinchona-based primary amine has been developed. The desired chiral spirocyclic benzofuranones were obtained in excellent stereoselectivities (dr>20:1 and up to 96% ee) and moderate to excellent yields (up to 98%). [Copyright &y& Elsevier]

An abstract of the article "Novel Asymmetric Organocatalytic Michael-Aldol-Dehydration Domino Reaction for the Construction of Spirocyclic Benzofuranones" by Liang-Wen Qi and colleagues is presented.

The first organocatalytic asymmetric cyclization of the title compounds is presented. [ABSTRACT FROM AUTHOR]

The annulation proceeds with anti- or syn-stereoselectivity depending on the N-protecting group of starting oxindoles. [ABSTRACT FROM AUTHOR]