Chemistry of thioacylsilanes part 11. Cyclic and open chain α-silyl vinyl sulfides as precursors of thioannulated cyclopentenones and thiofunctionalized enones
摘要:
Cyclic and open chain a-silyl vinyl sulfides, obtained from thioacylsilanes, react with acid chlorides in the presence of Lewis acid to give thioannulated cyclopentenones and thiofunctionalized enones. The effect of the substituents at silicon on these reactions has been investigated. (C) 1997 Elsevier Science Ltd.
Carbeneinsertionreactions with B-H bonds are a challenging but promising method for synthesis of organoboranes. Herein, we report visible-light-induced B-H insertions of HBpin with acylsilane. This metal-free and operationally simple reaction pro-ceeds in an atom-economical way with broad substrate scope under mild reaction conditions, affording a variety of important α-alkoxyorganoboronate esters
A highly stereoselective synthesis of Z-1,2-dialkylvinylsilanes from acylsilane/ylide chemistry
作者:John A. Soderquist、Charles L. Anderson
DOI:10.1016/s0040-4039(00)87898-3
日期:1988.1
The reaction, in the presence of soluble lithium salts, of non-stabilized ylides at low temperature with aliphatic derivatives of acylsilanes gives moderate to good (37–82%) yields of Z-1,2-disubstituted vinylsilanes in excellent (96%) isomeric purities for normal alkyl derivatives. Implications of these results on the mechanistic aspects of the Wittig olefination are discussed
Halo-substituted acylsilanes undergo cyclizations easily when heated in a polar solvent such as NMP to afford 2-silyldihydrofurans and 2-silyldihydropyrans. Unsaturated acylsilanes undergo cyclizations through reactions with iodine, phenylselenenyl bromide, or chloride. Further reactions of the cyclized products with pyridinium perbromide, phenylselenenyl bromide, or chloride give highly functionalized dihydrofurans and dihydropyrans. (C) 1999 Elsevier Science Ltd. All rights reserved.