hydrazides depended to a great extent on the choice of a solvent and catalyst. In the presence of dimethylformamide (DMF), β-alkyl nitroalkenes more likely converted into electron-rich allyl nitro compounds, which reacted with sulfonyl hydrazides to afford allylsulfones with high regioselectivity. While in acetonitrile (CH3CN), vinyl sulfones were obtained directly via sulfonation of electron-deficient β-alkyl
1,3-Difunctionalization of β-Alkyl Nitroalkenes via Combination of Lewis Base Catalysis and Radical Oxidation
作者:Ye Wang、Lei Zheng、Xiaodong Shi、Yunfeng Chen
DOI:10.1021/acs.orglett.0c04106
日期:2021.2.5
catalyst, β-alkyl-substituted nitroalkenes could be readily converted into allylicnitrocompounds. Examples of either C-1 or C-3 functionalization methods have been reported through nitro-elimination, giving alkene products. In this work, successful 1,3-difunctionalization was achieved through a synergetic Lewis base catalysis and TBHP radical oxidation, giving vinylic alkoxyamines in good to excellent
Transition Metal-Free Oxidative Cross-Coupling Reaction of Activated Olefins with <i>N</i>-Alkyl Amides
作者:Miaomiao Li、Lei Zheng、Li Ma、Yunfeng Chen
DOI:10.1021/acs.joc.0c02837
日期:2021.3.5
The K2S2O8-mediated transition metal-free oxidative cross-coupling reaction of activatedolefins with N-alkyl amides was developed, and the reaction gave N-allylic amides in moderate to good yield. This reaction protocol was suitable for different kinds of activatedolefins.
进行了K 2 S 2 O 8介导的活化烯烃与N-烷基酰胺的无过渡金属氧化交叉偶联反应,该反应以中等至良好的收率得到了N-烯丙基酰胺。该反应方案适用于不同种类的活化烯烃。
Rh-Catalyzed Highly Enantioselective Hydrogenation of Nitroalkenes under Basic Conditions
Go catalytic! A highlyenantioselectivehydrogenation of β,β‐disubstituted nitroalkenes and isomeric mixtures of nitroalkenes by using a Rh/DuanPhos catalytic system under basic conditions has furnished a convenient approach to β‐chiral nitroalkanes, which are otherwise not so easy to make (see scheme).