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
在环戊二烯基钴双(乙烯)存在下,研究了一系列吡啶酮和吡嗪酮衍生物对炔烃的反应性。根据底物的性质,可能会发生[2 + 2 + 2]-或[2 + 2]环加成,CH或NH活化。在吡啶酮的情况下,前三个主要由N保护的衍生物组成,而含有NH键的底物则遵循NH活化途径。N-丁炔基异喹诺酮的[2 + 2 + 2]环加成成功地用于脱水氢化可的松的全合成。吡嗪酮底物显示出相似的反应模式。