Cleavage of carbon-carbon bonds with high stereochemical control. 6. Asymmetric synthesis of chiral C-centered organosilanes by Haller-Bauer cleavage of optically active, nonenolizable .alpha.-silyl phenyl ketones
Michael Addition of Methyl 2-(Trimethylsilyl)propenoate with Organomagnesiums or Organolithiums Leading to 1:1 and/or 2:1 Adducts and Subsequent Peterson Olefination by Condensation with Carbonyl Compounds
Michael addition of methyl 2-(trimethylsilyl)propenoate with organomagnesiums or organolithiums leads to 1:1 and/or 1:2 adduct anions which can be utilized in the subsequent step of Peterson olefination with carbonyl compounds. The 1:1/1:2 ratio depends upon the nature of donor molecules, the reaction conditions such as reaction temperature, polarity of solvent, and rate of addition of the acceptor
Migration of trimethylsilylgroup from oxygen to α-carbon in silyl ketene acetals is effectively catalyzed by lanthanoid triflates under mild conditions. Scope and limitation of this rearrangement are presented.
Cleavage of carbon-carbon bonds with high stereochemical control. 6. Asymmetric synthesis of chiral C-centered organosilanes by Haller-Bauer cleavage of optically active, nonenolizable .alpha.-silyl phenyl ketones
作者:John P. Gilday、Judith C. Gallucci、Leo A. Paquette