2017
DOI: 10.3390/molecules22071096
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Enantioselective Michael Addition of Cyclic β-Diones to α,β-Unsaturated Enones Catalyzed by Quinine-Based Organocatalysts

Abstract: An enantioselective (52–98% ee) Michael addition between cyclic β-diones and α,β-unsaturated enones was established in the presence of quinine-based primary amine or squaramide. A variety of cinnamones were smoothly converted into the desired 3,4-dihydropyrans in moderate to high yields (63–99%). Chalcones were also suitable acceptors and gave rise to the expected adducts in satisfactory yields (31–99%). The resulting adducts readily underwent further modification to form fused 4H-pyran or 2,3-dihydrofuran.

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Cited by 10 publications
(6 citation statements)
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References 65 publications
(79 reference statements)
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“…Thus, it is possible to synthesize a wide range of new compounds and useful intermediates. [18] 2-benzylidene-1-indanone is a chalcone-like compounds and they give dimerization reaction via two consecutive Michael additions in basic media due to the presence of acidic methylene protons in their structures. [19] It is possible to see examples of various studies on the dimerization reactions of 2benzylidene-1-indanone derivatives in the literature such as A, [20] B, [21] C, [22] D, [23] and E [24] (Scheme 1).…”
Section: Introductionmentioning
confidence: 99%
“…Thus, it is possible to synthesize a wide range of new compounds and useful intermediates. [18] 2-benzylidene-1-indanone is a chalcone-like compounds and they give dimerization reaction via two consecutive Michael additions in basic media due to the presence of acidic methylene protons in their structures. [19] It is possible to see examples of various studies on the dimerization reactions of 2benzylidene-1-indanone derivatives in the literature such as A, [20] B, [21] C, [22] D, [23] and E [24] (Scheme 1).…”
Section: Introductionmentioning
confidence: 99%
“…Thus, the review of Alonso et al covers recent developments in the organocatalyzed asymmetric conjugate addition of carbon and heteroatom nucleophiles to nitroalkenes, a very interesting synthetic tool for the construction of highly functionalized synthetic building blocks [ 7 ]. The research article by Wang et al shows an enantioselective Michael addition between cyclic β-diones and α,β-unsaturated enones organocatalyzed by a quinine-based primary amine or squaramide [ 8 ].…”
mentioning
confidence: 99%
“…A reação aldólica é catalisada por ácidos, tanto de Lewis como de Brønsted, bem como por bases. Quando a reação é catalisada por ácidos ocorre a protonação do oxigênio da carbonila eletrofílica, deixando o carbono mais reativo e favorecendo o ataque do enol, proveniente do tautomerismo cetoenólico, devido à diminuição da energia do orbital molecular de fronteira LUMO (31). O produto aldol formado encontra-se na sua forma neutra e protonada em virtude do equilíbrio em meio ácido (Esquema 1.3A).…”
Section: Temperatura (°C)unclassified
“…Na abordagem da reação aldólica direta forma-se o íon enolato na presença do composto carbonílico aceitador e o catalisador quiral em uma única etapa reacional. Existem enzimas que participam da aldolização assimétrica na formação do íon enolato e como catalisadores quirais permitindo a reação aldólica direta, isto é devido ao fato das enzimas conterem resíduos de aminoácidos básicos no seu sítio ativo que podem realizar uma catálise via enamina; ou resíduos de aminoácidos ácidos que ativam o aldeído ao ataque nucleofílico por ligação de hidrogênio (31).…”
Section: Temperatura (°C)unclassified
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