Regio- and stereospecific rhodium-catalyzed allylic alkylation with an acyl anion equivalent: an approach to acyclic α-ternary β,γ-unsaturated aryl ketones
作者:Ben W. H. Turnbull、Jungha Chae、Samuel Oliver、P. Andrew Evans
DOI:10.1039/c6sc05705e
日期:——
γ-unsaturated aryl ketone, provides a useful synthetic handle for further functionalization via Kumada cross-coupling of the aryl trimethylammonium salt. Finally, the stereospecific alkylation of a chiral nonracemic secondary allylic carbonate affords the enantioenriched α-ternary aryl ketone, which was employed in a formal synthesis of trichostatic acid to illustrate that the allylic alkylation proceeds with
仲烯丙基碳酸酯与氰醇亲核试剂的区域和立体有择性铑催化的烯丙基烷基化促进了无环α-三元β,γ-不饱和芳基酮的直接构建。有趣的是,这项研究说明了解聚剂对区域控制的影响以及芳基组分的电子性质以抑制烯烃异构化。此外,我们证明了调节α-三元 β,γ-不饱和芳基酮的 p K a的二甲氨基取代基为通过以下途径进一步官能化提供了有用的合成方法。芳基三甲基铵盐的 Kumada 交叉偶联。最后,手性非外消旋仲烯丙基碳酸酯的立体有择烷基化得到对映体富集的 α-三元芳基酮,它被用于脱毛酸的正式合成中,以说明烯丙基烷基化随着构型的净保留而进行。