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-one 4-oxides.
在
AuCl3 或 CF3CO2Ag 催化下,2-炔基-
3-硝基噻吩发生分子内环偶合反应,生成相应的
噻吩并[3,2-c]
异恶唑,其第 3 位含有羰基官能团,而不是预期的 5-取代型 6H-
噻吩并[3,2-b]
吡咯-6-酮 4-氧化物。