Highly Regio‐, Diastereo‐, and Enantioselective Synthesis of Tetrahydroazepines and Benzo[
<i>b</i>
]oxepines through Palladium‐Catalyzed [4+3] Cycloaddition Reactions
作者:Barry M. Trost、Zhijun Zuo
DOI:10.1002/anie.201911537
日期:2020.1.13
A novel Pd0 -catalyzed asymmetric [4+3] annulation reaction of two readily accessible starting materials has been developed for building seven-membered heterocyclic architectures. The potential [3+2] side pathway could be suppressed though fine tuning of the conditions. A broad scope of cycloaddition donors and acceptors participated in the transformation with excellent chemo-, regio-, diastereo-,
Palladium-Catalyzed Diastereo- and Enantioselective [3 + 2] Cycloaddition of Vinylcyclopropanes with Azadienes: Efficient Access to Chiral Spirocycles
作者:Kai Liu、Jianfeng Yang、Xiaoxun Li
DOI:10.1021/acs.orglett.0c04062
日期:2021.2.5
azadienes (BDAs) have been widely used as four-atom synthons in transition-metal-mediated cycloaddition reactions, while the exploitation of their reactivity as a two-atom unit to construct spirocycles is still underdeveloped. Herein, we reported the first palladium(0)-catalyzed diastereo- and enantioselective [3 + 2] annulation of vinylcyclopropanes (VCPs) and BDAs. This transformation is featured with
Enantioselective synthesis of spirocyclic tetrahydrothiophene derivatives bearing a benzofuran-3(2H)-one scaffold. Unusual supramolecular crystal structure with high Z′
作者:Dorota Kowalczyk、Jakub Wojciechowski、Łukasz Albrecht
DOI:10.1016/j.tetlet.2016.04.111
日期:2016.6
Herein, we report our studies on the enantioselective synthesis of spirocyclic tetrahydrothiophene derivatives bearing a benzofuran-3(2H)-one scaffold. The developed method utilizes 2-arylidenebenzofuran-3(2H)-ones and 2-thioacetaldehyde, generated in situ from 1,4-dithiane-2,5-diol, as starting materials and proceeds in a cascade manner involving a thio-Michael-aldol reaction sequence. The absolute
The approach, based on the [3+2] cycloaddition between 2-arylidenebenzofuran-3(2H)-ones and imines derived from salicylaldehyde and diethyl aminomalonates, benefits from broad substrate scope, high chemical and stereochemical efficiency, and operational simplicity. Notably, simple and readily available quinine is employed as the catalyst of the reaction. Target products bearing two biologically relevant