Organosilicon and organophosphorus compounds with pseudohalogen groups. 1. Synthesis of alkoxydimethylsilyl cyanides and their reactions with metal fluorides
摘要:
Alkoxydimethylsilyl cyanides were synthesized by the exchange reaction of the corresponding alkoxydimethylchlorosilanes with trimethylsilyl cyanide, and also by the reaction of the former compounds with HCN in the presence of triethylamine (the latter method is preferential). Reactions of silyl cyanides with SbF3 and ZnF2 were studied. It was found that the reaction of silyl cyanides with SBF3 leads to the formation of Me2SiF2 and the corresponding alkoxydimethylfluorosilanes, which were also obtained by counter-synthesis from alkoxydimethylsilylchlorosilanes and metal fluorides (SbF3, ZnF2, CsF). Dimethylfluorosilyl cyanide was obtained by the reaction of silyl cyanides with ZnF2.
Stereocontrolled synthesis of α-glucosides by intramolecular glycosidation
作者:Mikael Bols
DOI:10.1039/c39920000913
日期:——
α-Glucosides are prepared by connecting phenylthio 3,4,6-tri-O-acetyl-α-D-glucopyranoside and an alcohol or a phenol with a dimethylsilylene bridge followed by iodonium ion catalysed intramolecular glycosidation.