Synthesis of Dibenzothiophene and 1,4-Dihydrodibenzothiophene Derivatives via Allylic Phosphonium Salt Initiated Domino Reactions
作者:Ke Li、Aimin Yu、Xiangtai Meng
DOI:10.1021/acs.orglett.8b00028
日期:2018.2.16
Two efficient synthetic protocols were developed for the synthesis of dibenzothiophene and 1,4-dihydrodibenzothiophene using thioaurones and allylic phosphonium salt. Mild reaction conditions, a one-pot procedure, and easily accessible starting materials make these protocols powerful tools for the synthesis of these compounds, which are often used in material and pharmaceutical sciences.
Using 1-thioaurones and 1-azaaurones as electron-deficient oxa-dienes, an organocatalyticasymmetric aromatizing inverse electron-demand [4+2] cycloaddition with γ-deconjugated butenolides and azlactones was developed. A wide range of opticallyactive benzothiophene-fused δ-lactones and indole-fused δ-lactones were obtained with desirable outcomes (up to 94% yield, >99 : 1 dr and 99% ee).
以1-硫代金酮和1-氮杂金酮作为缺电子氧杂二烯,开发了γ-去共轭丁烯内酯和吖内酯的有机催化不对称芳构化逆电子需求[4+2]环加成反应。以理想的结果获得了范围广泛的光学活性苯并噻吩稠合 δ-内酯和吲哚稠合 δ-内酯(高达 94% 的产率,>99:1 dr 和 99% ee)。
Stereo‐ and Regioselective Construction of Spirooxindoles Having Continuous Spiral Rings via Asymmetric [3+2] Cyclization of 3‐Isothiocyanato Oxindoles with Thioaurone Derivatives
作者:Hou‐Ze Gui、Zhe Meng、Zhan‐Shuai Xiao、Ze‐Ren Yang、Yin Wei、Min Shi
DOI:10.1002/ejoc.202001146
日期:2020.11.15
A highly efficient enantioselective [3+2] cyclization of 3‐isothiocyanato oxindoles with thioaurone derivatives was developed for the synthesis of spirooxindoles containing continuous spiral ring structures.
Substrate-controlled domino reactions between thioaurones or their analogues and crotonate-derived sulfur ylides were developed and produced a broad spectrum of benzothiophene-fused pyran derivatives, substituted chromene derivatives. In these reactions, crotonate-derived sulfur ylides acting as two-carbon synthons (α and β carbons or β and γ carbons) in annulation reactions are reported for the first