Notizen: Montmorillonite K-10 as Highly Efficient and Mild Catalyst for Deprotection of Ketone Dimethylhydrazones Using Microwaves in a Solventless System
Enantioselective Conia-Ene-Type Cyclizations of Alkynyl Ketones through Cooperative Action of B(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub>, <i>N</i>-Alkylamine and a Zn-Based Catalyst
作者:Min Cao、Ahmet Yesilcimen、Masayuki Wasa
DOI:10.1021/jacs.8b13757
日期:2019.3.13
An efficient and highly enantioselective Conia-ene-type process has been developed. Reactions are catalyzed by a combination of B(C6F5)3, an N-alkylamine and a BOX-ZnI2 complex. Specifically, through cooperative action of B(C6F5)3 and amine, ketones with poorly acidic α-C-H bonds can be converted in situ to the corresponding enolates. Subsequent enantioselective cyclization involving a BOX-ZnI2-activated
Conversion of n,n-dimethylhydrazones to carbonyl compounds by clay-supported ferric nitrate
作者:Pierre Laszlo、Eugenio Polla
DOI:10.1016/s0040-4039(01)81371-x
日期:1984.1
Cleavage of N,N-dimethylhydrazones is cleanly effected with good yield in dichloromethane using the extremely inexpensive clay-supported ferric nitrate.
N,N-二甲基hydr的裂解可以使用非常便宜的粘土支撑硝酸铁在二氯甲烷中以高收率干净地进行。
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。
Synthesis of Simple Hydrazones of Carbonyl Compounds by an Exchange Reaction
作者:G. R. Newkome、D. L. Fishel
DOI:10.1021/jo01341a008
日期:1966.3
Direct Spirocyclization from Keto-sulfonamides: An Approach to Azaspiro Compounds
Spontaneous spirocyclization of keto-sulfonamides via ynamides through a one-pot process is presented. Push pull ynamides were obtained through Michael addition/elimination without Cu. The obtained azaspiro compounds are building blocks for indole alkaloids. Theoretical studies provide insights into the mechanism of the formal Conia-ene reaction.