SYNTHESIS OF 5-(2-THIENYL)-4,5-DIHYDROFURA NS AND 7-(2-THIENYL)-2,8-DIOXABICYCLO[3.3.0]OCT-3-ENES USING MANGANESE(III)-BASED CYCLIZATION
DOI:
https://doi.org/10.37569/DalatUniversity.3.3&4.257(2013)Keywords:
Manganese(JII) acetate, Oxidative cycloaddition, cis fused dual cyclization.Abstract
1-Aryl-1-(2-thienyl)ethenes react with 2,4-pentanedione or ethylacetoacetate in boiling acetic acid under the presence of manganese triacetate dihydrate affording new 4,5-dihydrofurans bearing a thienyl ring at the 5 position. On the other hand, these ethenes react with 3-acetyl-1-phenylpentane-1,4-dione in a similar reaction leading to the formation of 7-(2-thienyl)-2,8-dioxabicyclo[3.3.0]oct-3-enes in high yields. The cis manner of fused bicyclic products is briefly discussed.
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