Catalytic Asymmetric Allylic C−H Activation as a Surrogate of the Asymmetric Claisen Rearrangement
作者:Huw M. L. Davies、Pingda Ren、Qihui Jin
DOI:10.1021/ol0167255
日期:2001.11.1
catalyzed decomposition of methyl aryldiazoacetates in the presence of alkenes results in allylic C-H activation by means of a rhodium-carbene induced C-H insertion. The resulting gamma,delta-unsaturated esters are equivalent to products that would be traditionally obtained from an asymmetric Claisenrearrangement. Highly regio- and enantioselective C-H insertions can be achieved, and in certain cases, good
Base Promoted Preparation of Alkenylsilanols from Allylsilanes
作者:Takahiko Akiyama、Shigeaki Imazeki
DOI:10.1246/cl.1997.1077
日期:1997.10
On treatment of allyl-t-butyldiphenylsilane with t-BuOK and 18-Crown-6 in DMSO at room temperature, isomerization of the olefinic double bond and subsequent substitution of phenyl group with hydroxy group took place smoothly to afford alkenylsilanol derivatives in good yields.
Asymmetric Intermolecular C−H Activation, Using Immobilized Dirhodium Tetrakis((<i>S</i>)-<i>N</i>-(dodecylbenzenesulfonyl)- prolinate) as a Recoverable Catalyst
作者:Huw M. L. Davies、Abbas M. Walji
DOI:10.1021/ol0273506
日期:2003.2.1
readily achieved on a pyridine functionalized highly cross-linked polystyrene resin. The immobilized complex is readily recycled and exhibits excellent catalytic activity for asymmetric intermolecular C-H activation by means of rhodium carbenoid induced C-H insertion.