Photoredox/cobaloxime co-catalyzed allylation of amines and sulfonyl hydrazines with olefins to access α-allylic amines and allylic sulfones
作者:Hui Xu、Hong Zhang、Qing-Xiao Tong、Jian-Ji Zhong
DOI:10.1039/d1ob01307f
日期:——
reported a dual-catalytic platform for the allylation of amines and sulfonyl hydrazines with olefins to selectively access α-allylic amines and allylic sulfones in good yields by combining photoredox catalysis and cobaloxime catalysis. This strategy avoided the use of a stoichiometric amount of terminal oxidant and the use of pre-functionalized allylic precursors, representing a green and ideal atom- & step-economical
Sulfonylative alkoxyhydroxylation of 2-arylpropenes
作者:Huei-Sin Wang、Yan-Shin Wu、Meng-Yang Chang
DOI:10.1016/j.tet.2017.09.047
日期:2017.11
2-arylpropenes 1 affords oxygenated sulfonylcumenes 4 in moderate yields via a sequential route: (i) NBS-mediated allylic bromination of 2-arylpropenes 1 in CH2Cl2, (ii) sodium sulfinates 2-promoted nucleophilic substitution of the resulting styryl bromides in a co-solvent of alcohol and water, and (iii) V2O5/H2O2 mediated alkoxyhydroxylation of corresponding styryl sulfones 3 in alcohol. The synthetic route provides
一键式三步合成2-芳基丙烯1的磺酰化烷氧基羟基化反应可通过以下顺序以中等收率得到含氧的磺酰基枯烯4:(i)NBS介导的CH 2 Cl 2中2-芳基丙烯1的烯丙基溴化,(ii)亚磺酸钠2醇和水的共溶剂中苯乙烯基溴化物的亲核取代反应得到促进;以及(iii)V 2 O 5 / H 2 O 2介导的相应苯乙烯基砜3的烷氧基羟化反应在酒精中。合成路线通过两个碳-氧和一个碳-硫键的形成为2-芳基丙烯1的1,2,3-三氟官能化提供了高效的方法。
Allylic C–S Bond Construction through Metal-Free Direct Nitroalkene Sulfonation
protocol was developed for the preparation of allylic sulfones through direct condensation of sodium arylsulfinates and β,β-disubstituted nitroalkenes. The key step of this process was the Lewis base-promoted equilibrium between nitroalkenes and allylic nitro compounds. Through this process, the readily available conjugated nitroalkenes can be easily converted into allylic nitro compounds, which contain
Visible-light induced oxidant-free oxidative cross-coupling for constructing allylic sulfones from olefins and sulfinic acids
作者:Guoting Zhang、Lingling Zhang、Hong Yi、Yi Luo、Xiaotian Qi、Chen-Ho Tung、Li-Zhu Wu、Aiwen Lei
DOI:10.1039/c6cc04109d
日期:——
An oxidant-free dehydrogenative sulfonylation of [small alpha]-methyl-styrene derivatives was developed for the construction of allylic sulfones by using eosin Y as a photosensitizer in conjunction with a cobaloxime catalyst. The process...
Tetrabutylammonium iodide catalyzed allylic sulfonylation of α-methyl styrene derivatives with sulfonylhydrazides
作者:Xiaoqing Li、Xiangsheng Xu、Can Zhou
DOI:10.1039/c2cc36960e
日期:——
Sulfonyl radicals generated from sulfonylhydrazides by the Bu4NIâtert-butyl hydroperoxide (TBHP) catalysis system underwent addition to a variety of α-methyl styrene derivatives to give the corresponding allylic sulfones. This selective allylic sulfonylation is metal-free, operationally simple, and environmentally friendly.