derivatives containing three stereocenters were prepared via one-step synthesis in yields ranging from 88 to 96% and in enantioselectivities (enantiomeric excess (ee)) ranging from 85 to 97%, with diastereoselectivities of approximately 14/2/1. Therefore, this method provides an efficientroute for the synthesis of a new class of opticallyactive 2-spirobenzothiophenones.
本报告描述了在金鸡纳生物碱胺存在下2-亚烷基苯并[ b ]噻吩酮衍生物与烯酮之间的有机催化级联反应。通过一步合成,制备了包含三个立体中心的螺苯并噻吩苯甲酸环己烷衍生物,其产率为88%至96%,对映选择性(对映体过量(ee))为85至97%,非对映选择性约为14/2/1。因此,该方法为合成新型的光学活性的2-螺苯并噻吩酮提供了有效的途径。
Construction of benzothiophene fused pyrrolidone in water <i>via</i> a catalyst-free process and a mechanism study
作者:Jinhui Shen、Aimin Yu、Lei Zhang、Xiangtai Meng
DOI:10.1039/d0gc01860k
日期:——
A novel three-component domino reaction towards benzothiophene fused pyrrolidone derivatives was developed in an environmentally benign manner.
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。
Darzens reaction of thioisatins and sulfonium salts: approach to the synthesis of thiochromenone derivatives with anticancer potency
A new Darzens reaction of thioisatins and sulfonium salts has, for the first time, been reported. This reaction allows efficient access to thiochromenone derivatives in good to excellent yields under mild reaction conditions. The substrate scope includes both electron-withdrawing and electron-donating groups on both the thioisatins and sulfonium salts. Moreover, some of the synthesized thiochromenone
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