Catalytic Allylic Alkylation via the Cross-Dehydrogenative-Coupling Reaction between Allylic sp3 C−H and Methylenic sp3 C−H Bonds
摘要:
A catalytic allylic alkylation was developed via the cross-dehydrogenative-coupling reaction of allylic sp3 C-H and methylenic sp3 C-H catalyzed by copper bromide and cobalt chloride in the presence of an oxidizing reagent, t-BuOOH. This methodology provides a direct way to use allylic sp3 C-H bonds for forming C-C bonds.
Catalytic Allylic Alkylation via the Cross-Dehydrogenative-Coupling Reaction between Allylic sp<sup>3</sup> C−H and Methylenic sp<sup>3</sup> C−H Bonds
作者:Zhiping Li、Chao-Jun Li
DOI:10.1021/ja056541b
日期:2006.1.1
A catalytic allylic alkylation was developed via the cross-dehydrogenative-coupling reaction of allylic sp3 C-H and methylenic sp3 C-H catalyzed by copper bromide and cobalt chloride in the presence of an oxidizing reagent, t-BuOOH. This methodology provides a direct way to use allylic sp3 C-H bonds for forming C-C bonds.
Regiodivergent Radical Termination for Intermolecular Biocatalytic C–C Bond Formation
作者:Mark R. Petchey、Yuxuan Ye、Victor Spelling、James D. Finnigan、Samantha Gittings、Magnus J. Johansson、Martin A. Hayes、Todd K. Hyster
DOI:10.1021/jacs.4c00482
日期:2024.2.21
Radical hydrofunctionalizations of electronically unbiased dienes are challenging to render regioselective, because the products are nearly identical in energy. Here, we report two engineered FMN-dependent “ene”-reductases (EREDs) that catalyze regiodivergent hydroalkylations of cyclic and linear dienes. While previous studies focused exclusively on the stereoselectivity of alkene hydroalkylation,
电子无偏二烯的自由基氢官能化很难实现区域选择性,因为产物的能量几乎相同。在这里,我们报道了两种工程化的FMN依赖性“烯”还原酶(ERED),它们可以催化环状和线性二烯的区域差异加氢烷基化。虽然之前的研究主要集中在烯烃加氢烷基化的立体选择性上,但这项工作强调了 ERED 可以控制氢原子转移的区域选择性,从而提供了一种选择性制备结构异构体的方法,而使用传统合成方法很难制备这种异构体。从Gluconabacter sp. 中工程化 ERED。 (GluER) 提供了一种有利于 γ,δ-不饱和酮的变体,而来自商业 ERED 面板的工程变体则有利于 δ,ε-不饱和酮。有益突变的影响已通过底物对接研究和同位素标记实验探讨的机制进行了研究。各种α-溴酮可以与环状和直链二烯偶联。这些有趣的构建模块还可以进一步修改以生成难以获得的杂环化合物。