Synthesis of furano[2,3-c]-pyran-3-one and thieno[2,3-c]-pyran-3-one derivatives through the coupling of 3-alkynyl-2-heteroaromatic carboxaldehydes with Fischer carbene complexes
作者:Yanshi Zhang、James W Herndon
DOI:10.1016/s0040-4039(00)02123-7
日期:2001.1
The coupling of Fischercarbenecomplexes with 3-alkynyl-2-heteroaromatic carboxaldehyde derivatives has been examined. The reaction affords pyrones fused to furans or thiophenes in a single step. The compounds are stable enough for isolation. If the carbenecomplex features a remote alkene substituent, a subsequent Diels–Alderreaction can occur.