223386-93-4Relevant articles and documents
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)
Bouillon, Jean-Philippe,Saleur, Damien,Portella, Charles
, p. 843 - 849 (2000)
2,5-Bis(trialkylsilyl)furans and 2,6-bis(trialkylsilyl)-4Hpyrans 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-2yl)ethane according to the reaction sequence metallation-silylationdethioketalization. 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 S(N) reaction of 1,3-dihalopropanes with 2-trialkylsilyl-2-lithio- 1,3dithiane and deprotection. The method allows efficient preparation of symmetrical as well as unsymmetrical bis(silylated) heterocycles.