Cobalt-Mediated [2+2+2] Cycloaddition versus CH and NH Activation of Pyridones and Pyrazinones with Alkynes: An Experimental Study
作者:Corinne Aubert、Patrick Betschmann、Michael J. Eichberg、Vincent Gandon、Thilo J. Heckrodt、Jürg Lehmann、Max Malacria、Birgit Masjost、Elisa Paredes、K. Peter C. Vollhardt、Glenn D. Whitener
DOI:10.1002/chem.200601823
日期:2007.9.7
thene) has been investigated. Depending on the nature of the substrates, [2+2+2]- or [2+2] cycloaddition, C-H, or N-H activation may occur. In the case of pyridones, the first three predominated with N-protected derivatives, whereas substrates containing N-H bonds followed an N-H activation pathway. The [2+2+2] cycloaddition of an N-butynylisoquinolone was applied successfully to the total synthesis