Remote control: The title reaction for β–ζ arylation of α‐amino esters with aryl bromides is described. This reaction, which occurs selectively at the terminal position of linear alkyl chains, gives rise to synthetically useful (hetero)arylalanines and homologues after debenzylation (see scheme).
Silyl ketene acetals are shown to be competent nucleophiles in Pd-catalyzed migrative C(sp3)–H arylations. Compared to the parent ester lithium enolates, they possess decreased reactivity but enhanced chemoselectivity. This behavior was exploited through the synthesis of valuable benzo-fused δ-lactones such as 1-isochromanones and dihydrocoumarins.
Copper(II)-Catalyzed Synthesis of Indoloquinoxalin-6-ones through Oxidative Mannich Reaction
作者:Anupal Gogoi、Prasenjit Sau、Wajid Ali、Srimanta Guin、Bhisma K. Patel
DOI:10.1002/ejoc.201501532
日期:2016.3
A Cu-catalyzed synthesis of indoloquinoxalin-6-one has been developed that starts from o-indolyl-N,N-dialkylamines through sp3 C–H bond oxidation α to the nitrogen atom with di-tert-butyl peroxide as oxidant. Other heterocycles, such as pyrrole, imidazole and benzimidazole derivatives also reacted successfully to give their respective fused quinoxalin-6-one derivatives. In this process, one of the
已经开发了一种 Cu 催化合成吲哚喹喔啉-6-one,该合成从邻吲哚基-N,N-二烷基胺开始,通过 sp3 C-H 键将 α 氧化为氮原子,并使用二叔丁基过氧化物作为氧化剂。其他杂环,如吡咯、咪唑和苯并咪唑衍生物也成功地反应得到它们各自的稠合喹喔啉-6-one衍生物。在这个过程中,甲基之一转化为羰基。