An efficient three-component domino or one-pot strategy has been developed for the synthesis of medicinally important benzothiophene and benzothiopheno[2,3-e]azepinedione derivatives for the first time. Amine-promoted selective cleavage of C–S bond of thioisatin is the key step in this process. The reported methodology benefits from environmentally friendly solvent (H2O), wide substrate scope, good
首次开发了一种有效的三组分多米诺骨牌或一锅法,用于合成具有医学重要性的苯并噻吩和苯并噻吩[2,3- e ]氮杂二酮衍生物。胺促进的硫代丝氨酸的C–S键选择性裂解是该过程的关键步骤。报告的方法得益于环保溶剂(H 2 O),较宽的底物范围,良好的官能团耐受性和较高的反应产率。
Selective Synthesis of Benzothiophene‐Fused Polycyclic, Eight‐Membered N‐Heterocycles via Amine‐Mediated Three‐Component Domino Strategy
作者:Qingsong Deng、Aimin Yu、Lei Zhang、Xiangtai Meng
DOI:10.1002/adsc.202001129
日期:2021.2.16
to synthesize benzothiophene‐fused polycyclic, eight‐membered N‐heterocycles via a three‐component dominoreaction of thioisatins under catalyst‐free conditions. The reaction between tryptamine, thioisatin, and bromoacetophenone produced benzothiophene‐fused polycyclic compounds. In contrast, using D‐tryptophan methyl ester hydrochloride instead of tryptamine afforded benzothiophene‐fused eight‐membered
has been developed using either MeOH or H2O as the solvent, which constitutes a facile and efficient protocol for the solvent-controlled divergentsynthesis of five- and seven-membered S-heterocycles featuring a gem-difluoromethylene group. A gram-scale synthesis and the diversification of the product transformations to other difluorinated S-heterocycles further highlight its utility.
苯并[ b ]噻吩-2,3-二酮与二氟烯氧基硅烷的前所未有的无催化剂反应已开发使用MeOH或H 2 O作为溶剂,这构成了溶剂控制的五个发散合成的简便有效的方案- 和七元S -杂环,具有一个gem -二氟亚甲基基团。克级合成和产品向其他二氟化S-杂环转化的多样化进一步突出了其效用。
Sustainable access to benzothiophene derivatives bearing a trifluoromethyl group <i>via</i> a three-component domino reaction in water
A catalyst-free three-componentdominoreaction was developed for the synthesis of benzothiophene fused pyrrolidones bearing a CF3 group for the first time. The notable advantages of this strategy over the existing methods include the use of water as a solvent at room temperature, transition metal-free conditions, a broad substrate scope, and easy scale-up synthesis. More importantly, the benzothiophene