Synthesis of 6-aroyl phenanthridines by Fe-catalyzed oxidative radical cyclization of 2-isocyanobiphenyls with benzylic alcohols
作者:Ziyi Nie、Qiuping Ding、Yiyuan Peng
DOI:10.1016/j.tet.2016.11.010
日期:2016.12
A practical method for the synthesis of 6-aroyl phenanthridine derivatives by Fe-catalyzed oxidative radicalcyclization of 2-isocyanobiphenyls with benzylic alcohols is described. In addition, this cyclization could be occurred by using toluene as aroyl source. The procedure tolerates various functional groups under simple conditions. A single-electron-transfer pathway is proposed according to mechanistic
Metal-, Photocatalyst-, and Light-Free Direct C–H Acylation and Carbamoylation of Heterocycles
作者:Matthew T. Westwood、Claire J. C. Lamb、Daniel R. Sutherland、Ai-Lan Lee
DOI:10.1021/acs.orglett.9b02679
日期:2019.9.6
Direct C-H acylations and carbamoylations of heterocycles can now be readily achieved without requiring any conventional metal, photocatalyst, electrocatalysis, or light activation, thus significantly improving on sustainability, costs, toxicity, waste, and simplicity of the operational procedure. These mild conditions are also suitable for gram-scale reactions and late-stage functionalizations of
Synthesis of 6-acyl phenanthridines by oxidative radical decarboxylation–cyclization of α-oxocarboxylates and isocyanides
作者:Jie Liu、Chao Fan、Hongyu Yin、Chu Qin、Guoting Zhang、Xu Zhang、Hong Yi、Aiwen Lei
DOI:10.1039/c3cc49026b
日期:——
A silver catalysed synthesis of 6-acyl phenanthridines by oxidative radical decarboxylation–cyclization of α-oxocarboxylates and isocyanides was developed.
type of Minisci reaction for regiospecificacylation of phenanthridine has been developed based on cross dehydrogenative coupling (CDC) strategy. Using substoichiometric amount of TBAB (tetrabutylammonium bromide, 30 mol %) and K2S2O8 as an oxidant, acyl radicals generate from aldehyde substrates under thermal conditions followed by a regiospecific intermolecular acylation with phenanthridine. Furthermore
在这项研究中,基于交叉脱氢偶联(CDC)策略,已开发出一种新型的Minisci反应,用于菲啶的区域特异性酰化。使用亚化学计量的TBAB(四丁基溴化铵,30摩尔%)和K 2 S 2 O 8作为氧化剂,在热条件下由醛底物生成酰基,然后用菲啶进行区域特异性的分子间酰化。此外,初步研究表明,当K 2 S 2 O 8 / TBAB被(NH 4)2 S 2 O 8取代时,酰化反应可以在室温下进行。在可见光照射下,将另外的5mol%的fac- Ir(ppy)3用作光催化剂。该分子间酰化反应提供了容易获得6-酰化菲啶衍生物的途径。
Metal-free oxidative isocyanides insertion with aromatic aldehydes to aroylated N-heterocycles
A metal-free, mild and efficient protocol for the construction of aroylated N-heterocycles via radical cascade aroylation of phenyl or vinyl isocyanides with aromatic aldehydes has been developed. Both phenanthridine and isoquinoline derivatives are delivered quickly in moderate to good yields with high regioselectivity.