Treatment of alkynes with ortho-formyl and acetyl phenylboronic acids in the presence of a cobalt catalyst resulted in the formation of 2,3-disubstituted indenols in good yields. When aryl silyl alkynes were used, 2-aryl-3-silyl indenols were obtained regioselectively in good yields.
- 2,3-Disubstituted indenol
- ortho-Carbonylated phenylboronic acid
- Silyl aryl alkyne
- [3+2] annulation