Unexpected Regioselectivity in Cycloisomerization of 2-Alkynyl-3-nitrothiophenes

[摘要]：The intramolecular cycloizomerization of 2-alkynyl-3-nitrothiophenes was catalyzed by AuCl3 or CF3CO2Ag to produce the corresponding thieno[3,2-c]isoxazoles bearing carbonyl functionality in position 3 instead of expected 5-substituted 6H-thieno[3,2-b]pyrrol-6-one4-oxides.

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