convenient diastereoselective procedures have been developed to prepare nearly stereoisomerically pure (E)-1-trimethylsilyl-2-alkenes (4), (E)-1-trimethylsilyl-1-alken-3-ynes (5), (1E,5E)-1-trimethylsilyl-1,5-alkadien-3-ynes (6), and (1E,3E)-1-trimethylsilyl-1,3-alkadienes (8) from stereoisomeric mixtures of alkenyl bromides. Compounds 5 have been stereoselectively converted into (1E,3Z)-1-trimethylsilyl-1
Silyl isoxazolines-2: synthesis, structure and properties
作者:E. Lukevics、V. Dirnens、A. Kemme、J. Popelis
DOI:10.1016/0022-328x(96)06358-9
日期:1996.8
Silyl isoxazolines have been synthesized by [2 + 3] cycloaddition reaction of nitrileoxides and silylnitronates to vinyl- and allylsilanes. The direction of the cycloaddition reaction of nitrileoxides to trialkoxyvinylsilanes has been shown to depend on the nature of the substituents on silicon and on the method used to generate the nitrileoxides. The addition of silyl esters of aci-nitromethane
Palladium - catalyzed reactions of trialkylstannyl phenyl sulfides with alkenyl bromides. A new diastereoselective synthesis of (E)-1-alkenyl phenyl sulfides
作者:Adriano Carpita、Renzo Rossi、Barbara Scamuzzi
DOI:10.1016/s0040-4039(00)99102-0
日期:1989.1
The reaction of easily available stereoisomeric mixtures of 1-alkenyl bromides with molar excesses of trialkylstannyl phenylsulfides takes place readily in the presence of Pd(PPH3)4 to afford diastereoselectively (E)-1-alkenyl phenylsulfides in excellent yields.