The first synthesis of 2-amino-1,4-dihydroquinolines
摘要:
A versatile strategy is described for the synthesis of new 2-amino-1,4-dihydroquinolines. it involved a Knoevenagel condensation of N-protected-2-amino-5-bromobenzaldehyde with ethylcyanoacetate, followed by a cyclization and protection of the NH group to afford the key intermediates 7 or 19. Then various 1,4 addition reactions have been performed to introduce substituents on the upper part of the 2-amino-1,4-dihydroquinolines. (C) 2009 Elsevier Ltd. All rights reserved.
Rh-catalyzed Transient Directing Group Promoted C-H Amidation of Benzaldehydes Utilizing Dioxazolones
作者:Xiaoyang Wang、Song Song、Ning Jiao
DOI:10.1002/cjoc.201700726
日期:2018.3
Transition‐metal catalyzedC—H functionalization of benzaldehydes is of great interest in organic synthesis. Herein, we developed a transient directing group assisted amidation of benzaldehydes catalyzed by rhodium catalyst. With the employment of 10 mol% of 4‐trifluoromethyl aniline, the in situ generated imine groups as the directing group efficiently enable this transformation. By using this protocol