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2005
Benzofuran derivatives
R 0070
Facile Synthesis of Regio Isomeric Naphthofurans and Benzodifurans. —
facile synthesis of regioisomeric naphthofurans and benzodifurans by base-catalyzed
22- 100 A
dehydrative cyclization reaction of appropriate o-alkoxybenzoylarene derivatives is
reported. Depending on the α-substituent in the alkyl halide, the reactions of (I), (VIII)
and (XIII) with alkyl halides in the presence of K2CO 3 in acetone either stop at the alkylation stage or further proceed to the cyclization/dehydration step. In the former case,
when the α-substituent is an ethoxycarbonyl or nitrile, naphthofurans and benzodifuran
(XV) are obtained in two steps. — (PARK*, K. K.; JEONG, J.; Tetrahedron 61 (2005)
3, 545-553; Dep. Chem., Chungnam Natl. Univ., Taejon 305-764, S. Korea; Eng.) —
Bartels
2005
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