Facile Synthesis of 3-Nitro-2-substituted Thiophenes.
J ORG CHEM
2534 - 2538.
A new approach to 3-nitro-2-substituted thiophenes has been developed. Exposure of commercially available 1,4-dithane-2,5-diol to nitroalkenes in the presence of 20% triethylamine results in a tandem Michael intramolecular Henry reaction to form the corresponding tetrahydrothiophene. Subsequent microwave irradiation on acidic alumina in the presence of chloranil effects the solvent free dehydration and aromatization to form 3-nitro-2-substituted thiophenes cleanly and rapidly. A simple workup procedure removes the requirement for purification by chromatography in most cases.
|Title:||Facile Synthesis of 3-Nitro-2-substituted Thiophenes|
|Keywords:||FIELD-EFFECT TRANSISTORS, THIN-FILM TRANSISTORS, AMORPHOUS MOLECULAR MATERIALS, WILLARDIINE DERIVATIVES, CARBONYL-COMPOUNDS, SEMICONDUCTORS, OLIGOTHIOPHENES, PERFORMANCE, MICROWAVES, OLIGOMERS|
|UCL classification:||UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Chemistry|
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