由于氢化产物的脱氢重新芳构化和氮原子的中毒作用,多环含氮杂芳族化合物的不对称氢化仍然是一个巨大的挑战。这里,通过在原位用乙酸酐来抑制rearomatization和中毒效果,多环含氮杂的新型铱-催化的对映选择性氢化的氢化产物保护-吡咯并/吲哚并[1,2一]喹喔啉和菲啶-已经成功可以轻松获得高达98%ee的手性二氢吡咯并/吲哚并[1,2- a ]喹喔啉和二氢菲啶。该策略具有广泛的底物范围,易于操作和潜在的医学应用。
Terminal methyl as a one-carbon synthon: synthesis of quinoxaline derivatives<i>via</i>radical-type transformation
作者:Xinfeng Wang、Huanhuan Liu、Caixia Xie、Feiyu Zhou、Chen Ma
DOI:10.1039/c9nj04910j
日期:——
pyrrolo[1,2-a]quinoxaline derivatives has been developed. Ferric chloride served as a promoter and as a Lewis acid in the reaction. Solvents provided the corresponding carbon sources simultaneously. The majority of solvents with terminal methyl groups, including ethers, amines and dimethyl sulfoxide, were reactive in the synthesis of quinoxaline derivatives at a certain yield via C–H(sp3) amination/C–O
已经开发了铁促进的吡咯并[1,2- a ]喹喔啉衍生物的构建方法。氯化铁在反应中用作促进剂和路易斯酸。溶剂同时提供了相应的碳源。大多数带有末端甲基的溶剂,包括醚,胺和二甲基亚砜,在通过C–H(sp 3)胺化/ C–O或C–N(C–S )分裂。该方法适用于多种吡咯并[1,2- a ]喹喔啉和吲哚并[1,2- a ]喹唑啉底物。
Synthesis of pyrrolo[1,2-a]quinoxalines via copper or iron-catalyzed aerobic oxidative carboamination of sp<sup>3</sup>C–H bonds
作者:Chenshu Dai、Siqi Deng、Qiuhua Zhu、Xiaodong Tang
DOI:10.1039/c7ra09214h
日期:——
We developed an aerobic oxidative carboamination of sp3C–H bonds with 2-(1H-pyrrol-1-yl)anilines for synthesis of pyrrolo[1,2-a]quinoxalines.
A ruthenium-catalyzed [5+1] annulation of 1-(2-aminophenyl)pyrroles with α-carbonyl sulfoxonium ylides is reported. This reaction provides a one-step method for synthesizing pyrrolo[1,2-a]quinoxaline derivatives under ambient conditions. The system proceeds with a short reaction time and a high functional-group tolerance. Notably, this divergent protocol tolerates β-keto sulfoxonium ylides and can
Copper-Catalyzed Synthesis of Alkyl-Substituted Pyrrolo[1,2-a]quinoxalines from 2-(1H-Pyrrol-1-yl)anilines and Alkylboronic Acids
作者:Rulong Yan、Xin Guan
DOI:10.1055/s-0037-1610743
日期:2020.3
A radical pathway for the construction of pyrrolo[1,2-a]quinoxalines by using 2-(1H-pyrrol-1-yl)anilines and alkylboronic acids has been developed. Features of this process include Cu catalysis, readily accessible starting materials, and simple operations. Alkylboronic acids are used for the construction of pyrrolo[1,2-a]quinoxaline derivatives, and the desired products are obtained in moderate yields
Annulation of 1-(2-Aminoaryl)pyrroles, Ethers with Elemental Sulfur To Give 1,3,6-Benzothiadiazepine Derivatives through Double C–S Bond Formation and C–O Cleavage of Ethers
作者:Jie Zhang、Chuwen Song、Linfeng Sheng、Ping Liu、Peipei Sun
DOI:10.1021/acs.joc.8b03187
日期:2019.2.15
An efficient three-component reaction of 1-(2-aminoaryl)pyrroles, ethers, and elemental sulfur for constructing N-heterocycle-fused 1,3,6-benzothiadiazepines under transition-metal-free conditions has been developed. Ethers act as both reactants and solvent in this reaction. The method proceeds efficiently over a broad range of substrates with good functional group tolerance.