RSS-Feed abonnieren
DOI: 10.1055/s-2000-6284
Synthesis of Symmetrical and Unsymmetrical 2,5-Bis(trialkylsilyl)furans and 2,6-Bis(trialkylsilyl)-4H-pyrans from 1,4- and 1,5-Bis(acylsilanes)
Publikationsverlauf
Publikationsdatum:
31. Dezember 2000 (online)
![](https://www.thieme-connect.de/media/synthesis/200006/lookinside/thumbnails/10.1055-s-2000-6284-1.jpg)
2,5-Bis(trialkylsilyl)furans and 2,6-bis(trialkylsilyl)-4H-pyrans have been synthesized by cyclodehydration of 1,4- and 1,5-bis(acylsilanes) under p-toluenesulfonic acid catalysis. The 1,4-bis(acylsilanes) have been prepared from 1,2-bis(1,3-dithian-2-yl)ethane according to the reaction sequence metallation-silylation-dethioketalization. The 1,5-bis(acylsilanes) have been prepared from 1,3-bis(1,3-dithian-2-yl)propane by a similar strategy or from a SN reaction of 1,3-dihalopropanes with 2-trialkylsilyl-2-lithio-1,3-dithiane and deprotection. The method allows efficient preparation of symmetrical as well as unsymmetrical bis(silylated) heterocycles.
furans - 4H-pyrans - acylsilanes - cyclizations - dithianes - heterocycles