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 Claisen rearrangement. Highly regio- and enantioselective C-H insertions can be achieved, and in certain cases, good
[反应:请参见文字]。在烯烃存在下,四[N- [4-十二烷基苯基]磺酰基]-(S)-脯氨酰]-铑[Rh2(S-DOSP)4]催化的芳基重氮乙酸甲酯的分解导致烯丙基CH活化(通过铑-卡宾诱导的CH插入。所得的γ,δ-不饱和酯等同于传统上从不对称克莱森重排获得的产物。可以实现区域和对映选择性很高的CH插入,在某些情况下,还可以实现良好的非对映控制。