azaheterocycle N-oxides with alkenes catalyzed by iodine under metal- and external oxidant-free reaction conditions has been developed. A variety of (E)-2-styrylazaheterocycles have been produced in moderate to excellent yields. The mechanistic exploration indicated that the N-oxide group played dual roles as both the directing group and an internal oxidant in this catalytic cycle.
Metal‐Free Synthesis of Alkenylazaarenes and 2‐Aminoquinolines through Base‐Mediated Aerobic Oxidative Dehydrogenation of Benzyl Alcohols
作者:Dipak J. Dahatonde、Aritra Ghosh、Sanjay Batra
DOI:10.1002/ejoc.202100420
日期:2021.5.20
A metal‐free, base‐mediated oxidative dehydrogenative coupling of substituted phenylmethanols (benzyl alcohols) with methyl azaarenes or phenylacetonitriles to afford substituted alkenylazaarenes or 2‐aminoquinolines, respectively is presented.
Iron-catalyzed C(sp<sup>3</sup>)–H functionalization of methyl azaarenes: a green approach to azaarene-substituted α- or β-hydroxy carboxylic derivatives and 2-alkenylazaarenes
作者:Danwei Pi、Kun Jiang、Haifeng Zhou、Yuebo Sui、Yasuhiro Uozumi、Kun Zou
DOI:10.1039/c4ra10939b
日期:——
An iron-catalyzed C(sp3)–H functionalization of methyl azaarenes with carbonyls to access the title compounds have been described.
Oxidant-Controlled C-sp<sup>2</sup>/sp<sup>3</sup>–H Cross-Dehydrogenative Coupling of N-Heterocycles with Benzylamines
作者:Rohit Sharma、Mohd Abdullaha、Sandip B. Bharate
DOI:10.1021/acs.joc.7b00856
日期:2017.9.15
cross-dehydrogenative coupling (CDC) of benzylamines with N-heterocycles having sp2 or sp3 carbon resulted in the formation of C-benzoylated or alkenylated products. Benzoylation of N-heterocycles occurs via (NH4)2S2O8 catalyzed benzoyl radical formation. An oxidative alkenylation of N-heterocycles having C-sp3 carbon (2-methylaza-arenes) occurs via deamination of benzylamine followed by C-sp3-H bond activation
苄基胺与具有sp 2或sp 3碳的N-杂环的氧化剂控制的离子液体介导的交叉脱氢偶联(CDC)导致C-苯甲酰化或烯基化产物的形成。N-杂环的苯甲酰化是通过(NH 4)2 S 2 O 8催化的苯甲酰基基团形成的。具有C-sp 3碳的N-杂环(2-甲基氮杂芳烃)的氧化烯基化反应是通过苄胺的脱氨基反应,然后以高立体选择性进行C-sp 3 -H键活化而进行的。苯甲酰化和烯基化方案均不含金属,绿色,简单,有效,并且可耐受多种官能团。
Oxidative Olefination of Secondary Amines with Carbon Nucleophiles
An unprecedented olefination reaction of secondaryamines with carbon nucleophiles has been developed through C–N/C–H functionalization under metal-free oxidative conditions. In the presence of a stoichiometric amount of 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ), a range of secondary N-alkylanilines smoothly underwent oxidative olefination with 2-alkylazaarenes, acetophenone, and malononitrile