Cyclobutene Ring-Opening of Bicyclo[4.2.0]octa-1,6-dienes: Access to CF<sub>3</sub>-Substituted 5,6,7,8-Tetrahydro-1,7-naphthyridines
作者:Artur K. Mailyan、Alexander S. Peregudov、Pierre H. Dixneuf、Christian Bruneau、Sergey N. Osipov
DOI:10.1021/jo301501r
日期:2012.10.5
An efficient method for the synthesis of novel CF3-substituted tetrahydro-1,7-naphthyridines including cyclic alpha-amino acid derivatives has been developed. The method is based on unusual cyclobutene ring-opening of bicyclo[4.2.0]octa-1,6-dienes with pyrrolidine to afford the corresponding 1,5-diketones followed by their heterocyclization. A convenient one-pot procedure has been also elaborated starting from readily available trifluoromethylated 1,6-allenynes.