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Investigations of substituted benzofuran‐3‐carboxylates, benzo[1,2‐b:4,5‐b']difurans an...
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Investigations of substituted benzofuran‐3‐carboxylates, benzo[1,2‐b:4,5‐b']difurans and benzo[1,2‐b:4,3‐b']difurans
作者:
H. L. McPherson,
B. W. Ponder,
期刊:
Journal of Heterocyclic Chemistry
(WILEY Available online 1978)
卷期:
Volume 15,
issue 1
页码: 43-48
ISSN:0022-152X
年代: 1978
DOI:10.1002/jhet.5570150110
出版商: Wiley‐Blackwell
数据来源: WILEY
摘要:
AbstractThe Michael addition of ethyl acetoacetate to benzoquinone, toluquinone, and chlorobenzo‐quinone leads to formation of substituted 5‐hydroxybenzofuran‐3‐earboxylates and linear benzo‐[1,2‐b:4,5‐b']difurans. The previously reported structural proof for the benzodifurans obtained from chlorobenzoquinone and toluquinone, although correct in the conclusion, is shown to be invalid. Proof of the linear benzodifuran structures was obtained by comparison of the uv spectra with authentic angular benzo[1,2‐b:
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