Regioselective Synthesis of 4,6,7-Trisubstituted Benzofurans from Furfural Imines and Nonheteroatom Stabilized Alkynylcarbene Complexes
作者:José Barluenga、Aránzazu Gómez、Javier Santamaría、Miguel Tomás
DOI:10.1021/ja9063712
日期:2009.10.21
Nonheteroatom stabilized chromium alkynlcarbene complexes 3,6, generated in situ from Fischer cabene complexes 1, smoothly react with furan-2-ylmethanimines 4 to provide substituted 7-aminobenzofurans 5 in moderate to good yields. The procedure involves the construction of the arene ring by a regioselective [3+3] carbocyclization reaction.