期刊
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
卷 2022, 期 39, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejoc.202200984
关键词
Benzo[b]furans; Cyclization; Fused-heterocycles; Alkynes; Base-catalyzed
资金
- FAPERGS
- CAPES
- CNPq
Heterocycles fused to seven-membered rings were synthesized in a highly selective manner using potassium tert-butoxide-catalyzed one-pot cyclization. Systematic study revealed that a catalytic amount of potassium tert-butoxide, dimethyl sulfoxide, and the tert-BuOK/tert-BuOH equilibrium played crucial roles in the formation of products.
Heterocycles fused to seven-membered rings are synthesized in a highly selective fashion from (2-alkynylphenyl) benzyl ethers by a consecutive potassium tert-butoxide-catalyzed one-pot cyclization. Systematic study to determine the ideal conditions revealed that a catalytic amount of potassium tert-butoxide, dimethyl sulfoxide, and the tert-BuOK/tert-BuOH equilibrium can play a crucial role in the formation of products. The optimized reaction conditions were applied to 2-alkynylphenyl benzyl ethers containing substituted aromatic systems directly bonded to the triple bond; however, they were ineffective for alkynes having alkyl groups. The protocol afforded the heterocycles fused to seven-membered rings in good yields by an exclusive 5-exo-dig/7-endo-dig one-pot sequence. The photophysical properties of compounds were investigated using absorption and emission fluorescence analyses. The emission analysis showed a blue to cyan emission. Large Stokes shift values were found for all compounds, which were attributed to the ICT state and the electronic properties of the substituents.
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