Synthesis 2021; 53(19): 3545-3554
DOI: 10.1055/a-1509-6078
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Base-Free Catalytic Wittig-/Cross-Coupling Reaction Sequence as Short Synthetic Strategy for the Preparation of Highly Functionalized Arylbenzoxepinones

Linda Pudnika
a   Latvian Institute of Organic Synthesis, Aizkraukles 21, 1006 Riga, Latvia
,
Ilona Domraceva
a   Latvian Institute of Organic Synthesis, Aizkraukles 21, 1006 Riga, Latvia
,
Thomas Werner
b   Paderborn University, Department of Chemistry, Warburger Straße 100, 33098 Paderborn, Germany
c   Leibniz Institute for Catalysis, Albert-Einstein-Straße 29a, 18059 Rostock, Germany
,
Raivis Zalubovskis
a   Latvian Institute of Organic Synthesis, Aizkraukles 21, 1006 Riga, Latvia
d   Institute of Technology of Organic Chemistry, Faculty of Materials Science and Applied Chemistry, Riga Technical University, 3/7 Paula Valdena Str., 1048 Riga, Latvia
,
Aiga Grandane
a   Latvian Institute of Organic Synthesis, Aizkraukles 21, 1006 Riga, Latvia
› Institutsangaben
This work was supported by the European Regional Development Fund (ERDF, project no. 1.1.1.2/VIAA/1/16/235).


Abstract

The facile synthesis of highly functionalized building blocks with potential biological activity is of great interest to medicinal chemistry. The benzoxepinone core structures commonly exhibit biological activity. Thus, a short and efficient synthetic route towards benzoxepine containing scaffold, which enables late stage modification was developed. Namely, base-free catalytic Wittig reactions enabled the synthesis of bromobenzoxepinones from readily available starting materials. Subsequent, Suzuki–Miyaura and Stille reactions proved to be suitable methods to access a variety of benzoxepinone diaryl derivatives by late stage modification in only three steps. This three-step reaction sequence is suitable for high throughput applications and gives facile access to highly complex molecular structures, which are suitable for further functionalization. The antiproliferative properties of selected arylbenzoxepinones­ were tested in vitro on monolayer tumor cell line A549. Notably, in this initial screening, these compounds were found to be active in the micromolar range.

Supporting Information



Publikationsverlauf

Eingereicht: 05. April 2021

Angenommen nach Revision: 17. Mai 2021

Accepted Manuscript online:
17. Mai 2021

Artikel online veröffentlicht:
21. Juni 2021

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