Metal- and Photocatalyst-Free Approach to Visible-Light-Induced Acylation of Quinoxalinones.
摘要:
A transition-metal- and photocatalyst-free photochemical reaction was successfully developed for the direct acylation of quinoxalin-2(1H)-ones, which was enabled by the formation of electron donor-acceptor (EDA) complexes. The use of DBU...
3-Metallierte Enamine XI<sup>1</sup>Transmetallierung 3-stannylierter Enamine<sup>2</sup>- Eine neue Methode zur Herstellung von 1-Aminoallyllithium-Verbindungen
作者:Hubertus Ahlbrecht、Peter Weber
DOI:10.1055/s-1992-26292
日期:——
3-Metallated Enamines XI1 Transmetallation of 3-Stannylated Enamines2 - a New Method to Generate 1-Aminoallyllithium Compounds The transmetallation of 3-stannylated enamines,3 1-morpholino-3-(trialkylstannyl)cycloalk-1-enes and 3-morpholino-5-(tributylstannyl)hex-3-ene, with butyllithium is a new and general way to generate 1-aminoallyllithium compounds. Stabilization by aromatic substituents is not further necessary as in the case of preparation by deprotonation and even the thermodynamically less stable exo- amino derivatives are accessible. Therefore homoenolate-equiva- lents of cyclic ketones are made available. Thus, the corresponding 3-alkylated or 3-silylated cycloalkanones and alken-3-ones were prepared via the 1-morpholinoallyllithium compounds.