The first direct use of carbon dioxide in the lactamization of alkenyl and heteroaryl C−H bonds to synthesize important 2‐quinolinones and polyheterocycles in moderate to excellent yields is reported. Carbon dioxide, a nontoxic, inexpensive, and readily available greenhouse gas, acts as an ideal carbonyl source. Importantly, this transition‐metal‐free and redox‐neutral process is eco‐friendly and desirable
Abstract Carbon dioxide (CO2) play a basic role as a sustainable feedstock during chemical synthesis. The considered approach should be moderated to be viable. Iron(II) trisbipyridine complex [Fe(Bpy)3]2+ supported over fibrous phosphosilicate (FPS) utilizing dipyridin ligands has been determined as highly valuable catalysts of cycloaddition of ortho-heteroaryl anilines with CO2 during the synthesis of
and straightforward approach for the synthesis of fused quinoxalinones via palladium-catalyzedcascade carbonylative cyclization of 2-heteroaryl iodobenzene and NaN3 has been achieved. The transformation might undergo cascade carbonylation, formation of acyl azide, a Curtius rearrangement, and an intramolecular cyclization sequence. The obtained heterocycle products can be easily transformed into other
通过钯催化的 2-杂芳基碘苯和 NaN 3的级联羰基环化合成稠合喹喔啉酮的简单直接的方法已经实现。该转化可能经历级联羰基化、酰基叠氮化物的形成、Curtius 重排和分子内环化序列。获得的杂环产品可以很容易地转化为其他结构多样的有价值的化合物,这证明了所开发协议的综合效用。
Reactions of (Vinylimino)phosphoranes and Related Compounds: Access to the Azacarbolines and Aplysinopsines
作者:Olivier Chavignon、Jean C. Teulade、Danielle Roche、Michel Madesclaire、Yves Blache、Alain Gueiffier、Jean L. Chabard、Gerard Dauphin
DOI:10.1021/jo00100a051
日期:1994.10
Aza-Wittig-type reactions of iminophosphoranes 3a, 14a,b and 19, derived from azidovinyl (or -phenyl) derivatives and triphenylphosphine, with methyl or phenyl isocyanates were used to construct the framework of the azacarboline structures 7a,b-10, 20, 21a-d and aplysinopsine-type alkaloids 17a-d by electrocyclic ring closure or heterocumulene-mediated annelation.
Metal-Free C–H [5 + 1] Carbonylation of 2-Alkenyl/Pyrrolylanilines Using Dioxazolones as Carbonylating Reagents
作者:Jiang Nan、Pu Chen、Xue Gong、Yan Hu、Qiong Ma、Bo Wang、Yangmin Ma