Metathesis reactions of allylsilanes containing bulky aromatic substituents
摘要:
Bulky substituents, such as alpha-naphthyl and ferrocenyl groups, do not inhibit the metathesis of allylsilanes on a Re2O7/Al2O3-SnBu4 catalyst system. Metathesis represents a preparative synthetic method for the synthesis of 1,4-bis(alpha-napthyl-dimethylsilyl)- and 1,4-bis(ferrocenyldimethylsilyl)but-2-enes.
Catalytic Asymmetric [3+2] Annulation of Allylsilanes with Isatins: Synthesis of Spirooxindoles
作者:Nadine V. Hanhan、Nicolas R. Ball-Jones、Ngon T. Tran、Annaliese K. Franz
DOI:10.1002/anie.201105739
日期:2012.1.23
Silyl‐inspired spirocycle: The title reaction is the first example of a catalytic asymmetric [3+2] annulation reaction with allylsilanes. The annulation reaction utilizes a chiral ScCl2(SbF6)/L catalyst and TMSCl as a promoter to afford spirooxindoles in excellent enantioselectivity at room temperature. The SiC bond can be oxidized to deliver hydroxy‐substituted spirooxindoles. TMS=trimethylsilyl
(2,6-Dimethoxyphenyl)-dimethylsilyl group constitutes a neworthogonal masked hydroxyl group. Protodesilylation of this arylsilane occurs under photochemical conditions in the presence of alcohols such as hexafluoroisopropanol (HFIP) or isopropanol. These mild and neutralconditions thus allowed the oxidation of organosilicon compounds such as β-hydroxysilanes that are known to be prone to Peterson
Metathesis reactions of allylsilanes containing bulky aromatic substituents
作者:N. V. Ushakov、E. B. Portnykh、E. Sh. Finkel'shtein
DOI:10.1007/bf00961382
日期:1991.5
Bulky substituents, such as alpha-naphthyl and ferrocenyl groups, do not inhibit the metathesis of allylsilanes on a Re2O7/Al2O3-SnBu4 catalyst system. Metathesis represents a preparative synthetic method for the synthesis of 1,4-bis(alpha-napthyl-dimethylsilyl)- and 1,4-bis(ferrocenyldimethylsilyl)but-2-enes.