A highly efficient ultrasound-promoted synthesis of 2,3-disubstituted benzo[b]furans via intramolecular C-C bond formation in ionic liquid[bmim]BF sub(4) at room temperature

An efficient ultrasound-promoted synthesis of 2,3-disubstituted benzo[b]furans in the ionic liquid [bmim]BF sub(4) at room temperature is reported. 5-exo-digcarbanion-yne intramolecular cyclization is mediated using anhydrous K sub(3)PO sub(4) as a mild, inexpensive base under atmospheric conditions...

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Bibliographic Details
Published in:RSC advances 2012-12, Vol.3 (2), p.540-544
Main Authors: Yadav, Nisha, Hussain, MohdKamil, Ansari, MohdImran, Gupta, Puneet K, Hajela, Kanchan
Format: Article
Language:English
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Summary:An efficient ultrasound-promoted synthesis of 2,3-disubstituted benzo[b]furans in the ionic liquid [bmim]BF sub(4) at room temperature is reported. 5-exo-digcarbanion-yne intramolecular cyclization is mediated using anhydrous K sub(3)PO sub(4) as a mild, inexpensive base under atmospheric conditions giving the title benzo[b]furans in excellent yields. Ionic liquid [bmim]BF sub(4) has been used both as a reaction medium, as well as a catalyst for the C-C bond formation.
ISSN:2046-2069
DOI:10.1039/c2ra22355d