Ruthenium(II) Catalyzed Regiospecific C–H/O–H Annulations of Directing Arenes via Weak Coordination
摘要:
Ruthenium(II) catalyzed oxidative CH/OH annulations have been demonstrated using two different directing arenes viz. 2-arylquinolinone and 2-arylbenzoxazinone with internal alkynes. Regiospecific annulations have been observed for both directing arenes via the assistance of weaker carbonyl oxygen in the presence of a stronger nitrogen-directing site. In this substrate-controlled convergent protocol the weaker directing group dictates the annulation path.
A Mild, One-Pot Synthesis of 4-Quinolones via Sequential Pd-Catalyzed Amidation and Base-Promoted Cyclization
作者:Jinkun Huang、Ying Chen、Anthony O. King、Mina Dilmeghani、Robert D. Larsen、Margaret M. Faul
DOI:10.1021/ol800837z
日期:2008.6.1
A mild, one-pot synthesis of 4-quinolones is described. Under the optimal conditions, a variety of 2-substituted 4-quinolones were synthesized via sequential palladium-catalyzed amidation of 2'-bromoacetophenones followed by base-promoted intramolecular cyclization.