A detailed study of the heteroannulation of o-iodophenol with acetylenic substrates through palladium–copper catalysis leading to the synthesis of the 2-substituted benzofurans 21–29 is reported. An acylic compound 30 has been isolated and proved to be an intermediate in the synthesis of the benzofurans. Some of the benzofurans have been transformed into biologically active compounds.
本文报道了通过
钯-
铜催化剂作用下,邻
碘苯酚与
炔烃底物进行杂环加成反应,合成了2-取代
苯并呋喃21-29。分离得到了 acyclic化合物30,并证实其为
苯并呋喃合成过程中的中间体。部分
苯并呋喃已转化为具有
生物活性的化合物。