2-Aminoquinazolines by Chan–Evans–Lam Coupling of Guanidines with (2-Formylphenyl)boronic Acids
作者:Aigars Jirgensons、Vitalii V. Solomin、Alberts Seins
DOI:10.1055/s-0040-1707080
日期:2020.9
A new method is presented for the synthesis of 2-aminoquinazolines, which is based on a Chan–Evans–Lam coupling of (2-formylphenyl)boronic acids with guanidines. Relatively mild conditions involving the use of inexpensive CuI as a catalyst and methanol as a solvent permit the application of the method to a wide range of substrates. Nonsubstituted, N-monosubstituted, and N,N-disubstituted guanidines
提出了一种合成 2-氨基喹唑啉的新方法,该方法基于(2-甲酰基苯基)硼酸与胍的 Chan-Evans-Lam 偶联。涉及使用廉价的 CuI 作为催化剂和甲醇作为溶剂的相对温和的条件允许该方法应用于广泛的基材。未取代的、N-单取代的和 N,N-二取代的胍可用作反应物,以从容易获得的(2-甲酰基苯基)硼酸以中等产率得到相应的 2-氨基喹唑啉。
Regioselective N-alkylation with alcohols for the preparation of 2-(N-alkylamino)quinazolines and 2-(N-alkylamino)pyrimidines
In the presence of the [Cp*IrCl2]2/NaOH system, the direct N-alkylation of 2-aminoquinazolines and 2-aminopyrimidines with alcohols afforded the N-exosubstituted 2-(N-alkylamino)quinazolines and 2-(N-alkylamino)pyrimidines with 71–96% yields and complete regioselectivities. The protocol is highly attractive because of easily available starting materials, high atom efficiency and environmental friendliness
Nucleophilic aromatic substitution of heterocycles using a high-temperature and high-pressure flow reactor
作者:Manwika Charaschanya、Andrew R. Bogdan、Ying Wang、Stevan W. Djuric
DOI:10.1016/j.tetlet.2016.01.080
日期:2016.3
nucleophiles. Utilizing the Phoenix Flow Reactor™ in parallel with Design-of-Experiment software enabled rapid optimization of the SNAr protocol. This protocol facilitated efficient synthesis of a broad range of 2-aminoquinazolines, and was extended to 2-aminoquinoxalines and 2-aminobenzimidazoles.
我们在此报告的高温和高压的连续流协议来进行亲核芳香取代(S Ñ与氮亲核试剂的杂环的Ar)。通过将Phoenix Flow Reactor™与实验设计软件并行使用,可以快速优化S N Ar协议。该协议促进了广泛范围的2-氨基喹唑啉的有效合成,并扩展到2-氨基喹喔啉和2-氨基苯并咪唑。