Synthesis 2021; 53(21): 4097-4109
DOI: 10.1055/s-0037-1610781
paper

Cross-Coupling Reactions with 2-Amino-/Acetylamino-Substituted 3-Iodo-1,4-naphthoquinones: Convenient Synthesis of Novel Alkenyl- and Alkynylnaphthoquinones and Derivatives

a   Laboratory of Chemistry, Federal University of Rio de Janeiro - Campus Macaé, Aluísio da Silva Gomes Avenue, 50, Granja dos Cavaleiros, 27930-560, Macaé, RJ, Brazil
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b   Laboratory of Catalysis and Synthesis of Bioactive Substances (LACASB), Federal University of Rio de Janeiro–Campus Macaé, Imburo Road, No Number, Ajuda de Baixo, 27979-000, Macaé, RJ, Brazil
,
b   Laboratory of Catalysis and Synthesis of Bioactive Substances (LACASB), Federal University of Rio de Janeiro–Campus Macaé, Imburo Road, No Number, Ajuda de Baixo, 27979-000, Macaé, RJ, Brazil
,
a   Laboratory of Chemistry, Federal University of Rio de Janeiro - Campus Macaé, Aluísio da Silva Gomes Avenue, 50, Granja dos Cavaleiros, 27930-560, Macaé, RJ, Brazil
,
b   Laboratory of Catalysis and Synthesis of Bioactive Substances (LACASB), Federal University of Rio de Janeiro–Campus Macaé, Imburo Road, No Number, Ajuda de Baixo, 27979-000, Macaé, RJ, Brazil
› Institutsangaben
The authors acknowledge the financial support from Brazil’s governmental agencies (CAPES, FAPERJ, and CNPq).


Abstract

Functionalized 1,4-naphthoquinones have been employed as versatile synthons in organic synthesis, in addition to presenting a large array of biological activities. Herein, the applications of 2-amino-/ acetylamino-substituted 3-iodo-1,4-naphthoquinones in cross-coupling reactions are described to successfully afford sixteen novel 3-styryl-1,4-naphthoquinones (amino-stilbene-quinone hybrids) and four 3-alkynyl-1,4-naphthoquinone in overall good yields. Interestingly, the alkynylated derivatives could be obtained from ligand- and Pd-free CuI-mediated cross-coupling reactions, after extensive investigations to exclude Pd as a co-catalyst. Lastly, the desilanized terminal alkyne was subjected to click chemistry reactions to give two novel triazole-1,4-naphthoquinone hybrids.

Supporting Information



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Eingereicht: 22. Januar 2021

Angenommen nach Revision: 06. Juli 2021

Artikel online veröffentlicht:
23. August 2021

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