Catalytic enantioselective [2 + 2] cycloadditions between allenoates and alkenes is disclosed. The method functions well for a variety of alkenes, and the products are generated with excellent levels of enantioselectivity. One of the most significant aspects of the present method is that unactivated alkenes are suitable substrates for this method, which is distinctly different from nearly all other catalytic enantioselective [2 + 2] cycloaddition methods.
Expedient access to branched allylic silanes by copper-catalysed allylic substitution of linear allylic halides
作者:Devendra J. Vyas、Martin Oestreich
DOI:10.1039/b920793g
日期:——
An unprecedented copper-catalysed allylic transposition enables the regioselectivesynthesis of branched allylic silanes from linear allylichalides through direct C-Si bond formation.
Copper-Catalyzed SiB Bond Activation in Branched-Selective Allylic Substitution of Linear Allylic Chlorides
作者:Devendra J. Vyas、Martin Oestreich
DOI:10.1002/anie.201004658
日期:2010.11.2
The harder they come, the better they leave! Chloride is superior to all common leaving groups in the γ‐selective allylicsubstitution of linear precursors. This approach involves a novel copper‐catalyzed SiBbondactivation (see scheme; γ/α≥98:2, 7 examples; Si=SiMe2Ph and B=Bpin with pin=pinacolato).
他们来得越难,就越会离开!在线性前体的γ-选择性烯丙基取代中,氯化物优于所有常见的离去基团。这种方法涉及一种新型的铜催化的Si 乙键活化(参见方案;γ/α≥98:2,7例子;硅=森达2 P h和乙= BPIN与销=频哪醇)。
Catalytic enantioselective [2 + 2] cycloadditions between allenoates and alkenes is disclosed. The method functions well for a variety of alkenes, and the products are generated with excellent levels of enantioselectivity. One of the most significant aspects of the present method is that unactivated alkenes are suitable substrates for this method, which is distinctly different from nearly all other catalytic enantioselective [2 + 2] cycloaddition methods.