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Doctoral Thesis
DOI
https://doi.org/10.11606/T.46.2017.tde-22112017-143637
Document
Author
Full name
Anwar Shamim
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2017
Supervisor
Committee
Stefani, Helio Alexandre (President)
Kato, Massuo Jorge
Pimenta, Daniel Carvalho
Schpector, Julio Zukerman
Title in Portuguese
Funcionalização de 3,4,6-tri-O-acetil-D-glucal via click chemistry e reações de acoplamento cruzado catalizado por paládio
Keywords in Portuguese
1,2,3-Triazois
Acoplamento de Sonogashira
Ciclização de 5-endo-dig
Click Chemistry
D-glucal
Hidrostanação
Abstract in Portuguese
A funcionalização de 3,4,6-tri-O-acetil-D-glucal foi realizada utilizando reações de acoplamento cruzado (Sonogashira e Stille), ciclo-adições de azida-alcino (Click chemistry) e ciclização nucleófila promovida por eletrófilo. Utilizando estas reações juntamente com as já referidas transformações de grupos funcionais e reações de rearranjo de Ferrier, as bibliotecas de compostos à base de glucal foram sintetizadas e observadas em algumas moléculas fluorescência e outras foram disponibilizadas para avaliação de atividade biológica. Na primeira parte, foram sintetizadas bibliotecas de derivados de bis- e tris-triazolil-glicosila a partir de 3,4,6-tri-O-acetil-D-glucal utilizando as reações acima mencionadas. A segunda parte deste trabalho consiste em sintetizar uma biblioteca de derivados glucal de 2-alquinilo usando um acoplamento de Sonogashira livre de cobre e ligante, seguido por aplicações sintéticas destes alquinos glucais. A hidrostanação regioselectiva catalisada por paládio destes glucanos 2-alquinilo foi realizada utilizando hidreto de tributilestanho para gerar uma biblioteca de derivados estanil regioisoméricos de glucal. Além disso, estes derivados de 2-alquinil-glucal sintetizados na primeira parte também foram utilizados na ciclização nucleofílica 5-endo-dig promovida por eletrófilos para proporcionar derivados de glucal bicíclicos. Na parte final, os derivados de estanho de glucal foram utilizados para sintetizar bibliotecas de derivados de 2-alcenil glucal substituído. Esta parte inclui também transformações de grupos funcionais e acoplamentos cruzados (Stille e Sonogashira), bem como click chemistry para gerar bibliotecas de derivados de 2-alquenil-D-glucal alquinilo e triazolilo substituídos. Na maioria dos casos os produtos foram obtidos em rendimentos muito bons a excelentes que foram analisados utilizando RMN, Infra vermehlo, espectrometria de massas de alta resolução e outras técnicas analíticas quando aplicável.
Title in English
Functionalization of 3,4,6-tri-O-acetyl-D-glucal via click chemistry and palladium-catalyzed cross-coupling reactions
Keywords in English
1,2,3-Triazoles
5-endo-dig Cyclization
Click chemistry
D-glucal
Hydrostannation
Sonogashira coupling
Abstract in English
Functionalization of 3,4,6-tri-O-acetyl-D-glucal has been performed using cross-coupling (Sonogashira and Stille) reactions, azide-alkyne cycloadditions (Click chemistry) and electrophile-promoted nucleophilic alkyne cyclizations. Using these reactions along with the already reported functional group transformations (FGT) and Ferrier rearrangement reactions, libraries of glucal-based compounds were synthesized with members of characteristic photophysical and potential biological properties. In the first part, the synthesis of libraries of bis- and tris-triazolyl glycosyl derivatives is described starting from 3,4,6-tri-O-acetyl-D-glucal using the above-mentioned reactions. In the second part of this work, the synthesis of a library of 2-alkynyl glucal derivatives using a copper and ligand-free Sonogashira coupling, followed by synthetic applications of these glucal alkynes is reported. Palladium-catalyzed regioselective hydrostannation of these 2-alkynyl glucals was performed using tributyltin hydride to generate a library of regioisomeric stannyl derivatives of glucal. Moreover, these 2-alkynyl glucal derivatives synthesized in the first part were also used in electrophile-promoted nucleophilic 5-endo-dig cyclization to afford bicyclic glucal derivatives. In the final part, the use of stannyl derivatives of glucal to synthesize libraries of substituted 2-alkenyl glucal derivatives is described. This part also includes certain functional group transformations and cross-couplings (Stille and Sonogashira) as well as click chemistry to generate libraries of alkynyl and triazolyl substituted 2-alkenyl-D-glucal derivatives. In most of the cases, the products were obtained in very good to excellent yields and were analyzed using 1H NMR, 13C NMR, FTIR, HRMS, and other analytic techniques where applicable
 
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Publishing Date
2017-11-24
 
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