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au:"Siqueira, Geonir M."

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Aplicação de α-oxoceteno ditiocetais em síntese orgânica
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Siqueira, Geonir M.

; Neuenfeldt, Patrícia D.

; Duarte, Anaí

; Bretanha, Lizandra C.

; Freitag, Rogério A.

; Cunico, Wilson

Química Nova

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2010, Volume 33 N. 3 Pages 707 - 715

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

The synthesis and reactivity of α-oxoketenes dithioacetals (S,S-acetals), general structure [(R¹C=OC(R²)=C(SR³)(SR4)], are reported. We also showed the application of S,S acetals as synthons for efficient synthesis of isoxazoles, pyrazoles, indazoles, thiophenes, dithiol thiones, pyridines, pyrimidines and other heterocycles. This work aims to review the importance of α-oxoketenes dithioacetals in organic chemistry during the past few years.

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Regiospecific synthesis of 1,2-bis(azolyl)ethanes
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Martins, Marcos A. P.

; Cunico, Wilson

; Siqueira, Geonir M.

; Leidens, Victor L.

; Zanatta, Nilo

; Bonacorso, Helio G.

; Flores, Alex F. C.

Journal of the Brazilian Chemical Society

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apr 2005, Volume 16 N. 2 Pages 275 - 279

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Este trabalho mostra a síntese de 1,2-bis-(5'-trialometilisoxazol-3'-il)etanos (3-6) e 1,2-bis(5'-trialometilpirazol-3'-il)etanos (7-10) a partir da ciclocondensação de 1,1,1,10,10,10-hexahalo-4,7-dimetoxideca-3,7-dien-2,9-dionas (1 e 2) com hidroxilamina e hidrazinas. Também é mostrada a síntese dos 1,2-bis(5'-alcoxicarbonilpirazol-3'-il)etanos (11-14) via reação da dienona 2, triclorometil-substituída, e hidrazina.

The synthesis of 1,2-bis(5'-trihalomethylisoxazol-3'-yl)ethanes (3-6) and 1,2-bis(5'-trihalomethylpyrazol-3'-yl)ethanes (7-10) from the cyclocondensation of 1,1,1,10,10,10-hexahalo-4,7-dimethoxydeca-3,7-dien-2,9-diones (1 and 2) with hydroxylamine and hydrazines is reported. In addition, the one-pot synthesis of 1,2-bis(5'-alkoxycarbonylpyrazol-3'-yl)ethanes (11-14) by reaction of chloro-substituted dienone 2 and hydrazines is also described.

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