Copper-catalyzed tandem aerobic oxidative cyclization for the synthesis of 4-cyanoalkylpyrrolo[1,2-<i>a</i>]quinoxalines from 1-(2-aminophenyl)pyrroles and cyclobutanone oxime esters
作者:Zhenyu An、Yong Jiang、Xin Guan、Rulong Yan
DOI:10.1039/c8cc06256k
日期:——
A copper-catalyzed tandem ring-opening/cyclization reaction for the synthesis of 4-cyanoalkylpyrrolo[1,2-a]quinoxalines from 1-(2-aminophenyl)pyrroles and cyclobutanone oxime esters has been developed. This reaction involves C–C bond cleavage and C–C and C–N bond constructions with good functional group tolerance. A wide range of products are obtained in moderate to good yields under mild conditions
已开发了一种铜催化串联开环/环化反应,用于由1-(2-氨基苯基)吡咯和环丁酮肟酯合成4-氰基烷基吡咯并[1,2- a ]喹喔啉。该反应涉及C–C键断裂以及具有良好官能团耐受性的C–C和C–N键结构。在温和的条件下,可以以中等到良好的产率获得各种各样的产品。
FeCl<sub>3</sub>-Catalyzed synthesis of pyrrolo[1,2-a]quinoxaline derivatives from 1-(2-aminophenyl)pyrroles through annulation and cleavage of cyclic ethers
作者:Zhenyu An、Lianbiao Zhao、Mingzhong Wu、Jixiang Ni、Zhenjie Qi、Guiqin Yu、Rulong Yan
DOI:10.1039/c7cc07089f
日期:——
1-(2-aminophenyl)pyrroles and cyclic ethers, which includes functionalization of C(sp3)-H bonds and the construction of C–C and C–N bonds, has been developed. The features of this reaction are Fe catalysis, low-cost and readily accessible starting materials. Moreover, this procedure exhibits good functional group tolerance and a series of pyrrolo[1,2-a]quinoxaline derivatives are obtained in moderate to good
一种直接的铁催化从1-(2-氨基苯基)吡咯和环醚合成吡咯并[1,2- a ]喹喔啉的方法,包括C(sp 3)-H键的官能化和C–的构建已经开发了C和C–N键。该反应的特征是铁催化,低成本和易于获得的起始原料。此外,该方法表现出良好的官能团耐受性,并且以中等至良好的产率获得了一系列吡咯并[1,2- a ]喹喔啉衍生物。
TFAA‐Catalyzed Annulation Synthesis of Spiro Pyrrolo[1,2‐
<i>a</i>
]quinoxaline Derivatives from 1‐(2‐Aminophenyl)pyrroles and Benzoquinones/Ketones
作者:Jixiang Ni、Yong Jiang、Zhenjie Qi、Rulong Yan
DOI:10.1002/asia.201900567
日期:——
A metal-free trifluorosulfonate anhydride (TFAA)-catalyzed strategy for the synthesis of spiro pyrrolo[1,2-a]quinoxalines from 1-(2-aminophenyl)pyrroles and benzoquinones/ketones has been developed. With this general method, spiro pyrrolo[1,2-a]quinoxalines have been accessed via nucleophilic addition and cyclization. This reaction exhibits good functional group tolerance, and a wide range of products
Catalyst‐Controlled Chemodivergent Annulation to Indolo/Pyrrolo‐Fused Diazepine and Quinoxaline
作者:Sandip Dhole、Wei‐Jung Chiu、Chung‐Ming Sun
DOI:10.1002/adsc.201900088
日期:2019.6.18
Catalyst‐controlled chemodivergent annulation between o‐indolo anilines and diazo compounds has explored for the synthesis of indolo‐fused diazepine and quinoxaline. Under the Rh(III) catalyst, reaction proceeded through the free amine assisted C2−H activation followed by amidation leading to the diazepino[1,7‐a]indole in a highly selective manner. While with Ru(II) catalyst, reaction involves formation
在邻吲哚苯胺和重氮化合物之间进行催化剂控制的化学发散环化反应已被研究用于合成吲哚稠合的二氮杂and和喹喔啉。在Rh(III)催化剂下,反应通过游离胺辅助的C2-H活化进行,然后进行酰胺化反应,从而以高度选择性的方式生成重氮庚并[1,7- a ]吲哚。当使用Ru(II)催化剂时,反应涉及形成Ru-卡宾配合物,然后插入-NH 2基团,并通过金属茂型反应进行级联环化,通过β-氢化物消除作用制得吲哚[1,2- a]。以喹喔啉为主要产品。该策略指导模块化方法构建独特的吲哚并结合的二氮杂/喹喔啉以及吡咯并并的二氮杂/喹喔啉骨架,并具有极高的产率。
Enantioselective Construction of Quinoxaline-Based Heterobiaryls and P,N-Ligands via Chirality Transfer Strategy
Central-to-axial chirality transfer via C–N single bond oxidation was first achieved as a versatile and conceptually distinct strategy to prepare a new family of axiallychiral heteroaromatic biaryl backbones and P,N-ligands (named as Quinoxalinaps) in gram scale. Two atropisomers of Quinoxalinaps (ee >99%) were readily accessed from the same precursor enantiomer by a simple dehydrogenative oxidation