Regioselective α-Deuteration of Michael Acceptors Mediated by Isopropylamine in D<sub>2</sub>O/AcOD
作者:Vinod G. Landge、Kendra K. Shrestha、Aaron J. Grant、Michael C. Young
DOI:10.1021/acs.orglett.0c03839
日期:2020.12.18
hydrogen/deuteriumexchange is an important method to access deuterated compounds for chemical and biological studies. Herein is reported the first method for the regioselective α-deuteration of enals and enones. The transformation features D2O and AcOD as deuterium sources and amines as organocatalysts. The deuteration strategy is scalable and works on enals with a variety of substituted arene or heterocycle
特定地点的氢/氘交换是获取用于化学和生物研究的氘化化合物的重要方法。本文报道了第一种对 enals 和 enones 进行区域选择性 α-氘化的方法。转化的特点是 D 2 O 和 AcOD 作为氘源,胺作为有机催化剂。氘化策略是可扩展的,适用于具有各种取代芳烃或杂环基序以及烯酮的 enal。该方法已应用于氘代药物前体的合成。
Visible light-mediated metal-free double bond deuteration of substituted phenylalkenes
作者:Roman Iakovenko、Jan Hlaváč
DOI:10.1039/d0gc03081c
日期:——
Photoactivated metal free deuteration of a double bond was developed in an environmentally friendly manner.
双键的光活化金属无氘化反应以环境友好的方式进行了开发。
Indium(III)-catalyzed Coupling between Alkynes and Aldehydes to α,β-Unsaturated Ketones
The combined use of a catalytic amount of InX3 (X = OTf and NTf2) and 1-butanol was found to be effective in formal alkyne–aldehyde metathesis. With this catalytic system, aromatic alkynes reacted with aromatic aldehydes to give chalcones in moderate to good yields. Alkynals were efficiently converted into 5- to 7-membered cyclic compounds by intramolecular alkyne–aldehyde coupling.
The substituenteffects on the reactions of permanganate ion with unsymmetrical alkenes are analyzed on the assumption of a concerted (3 + 2) cycloaddition model by using an equation obtained by approximation based on the FMO theory in which development and localization of the frontier molecular orbitals at the reaction sites with progress of the reaction are considered. The Hammett plots are successfully
Tin(II) chloride, which is insensitive to water and air, mediated the coupling reaction between alkynes and aldehydes as a Lewis acid in nitromethane to produce (E)-α,β-unsaturated ketones by a skeletal transformation in which one alkynic carbon atom changed into an oxo carbon atom accompanied by the cleavage of a C=O bond in the starting aldehydes. This coupling reaction was promoted by a catalytic