Suzuki–Miyaura Coupling Reactions of Conjunctive Reagents: 2-Borylated Allylic Sulfones
摘要:
In support of various efforts in our group, we developed methods for the convenient Suzuki-Miyaura coupling of borylated allylic sulfones with various electrophiles in both inter- and the less common intramolecular modes. The procedure facilitates the preparation of a wide variety of sulfones in a straightforward fashion, including six- through eight-membered rings.
Ni-Catalyzed Reductive Allylation of α-Chloroboronates to Access Homoallylic Boronates
作者:Yixian Lou、Jian Qiu、Kai Yang、Feng Zhang、Chenglan Wang、Qiuling Song
DOI:10.1021/acs.orglett.1c01213
日期:2021.6.18
transition-metal-catalyzed allylation reaction is an efficient strategy for the construction of new carbon–carbon bonds alongside allyl or homoallylic functionalization. Herein we describe a Ni-catalyzed reductive allylation of α-chloroboronates to efficiently render the corresponding homoallylic boronates, which could be readily converted into valuable homoallylic alcohols or amines or 1,4-diboronates
过渡金属催化的烯丙基化反应是在烯丙基或均烯丙基官能化的同时构建新碳-碳键的有效策略。在本文中,我们描述了 α-氯硼酸酯的 Ni 催化还原烯丙基化,以有效地生成相应的高烯丙基硼酸酯,其可以很容易地转化为有价值的高烯丙基醇或胺或 1,4-二硼酸酯。该反应具有广泛的底物范围和良好的官能团兼容性,是对现有制备高烯丙基硼酸酯方法的补充。
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
Iron-Catalyzed Ring-Opening/Allylation of Cyclobutanone Oxime Esters with Allylic Sulfones
作者:Jing-Feng Zhao、Pin Gao、Xin-Hua Duan、Li-Na Guo
DOI:10.1002/adsc.201701630
日期:2018.5.2
radical allylation of cyclobutanone oxime esters with allylic sulfones via C−C bond cleavage is reported. This protocol provides a straight‐forward approach to cyanoalkylated alkenes with good functional group tolerance and high regioselectivity. Furthermore, this reaction can be further expanded to ring‐opening of less‐strained cyclopentanone oxime esters, leading to desired cyanoalkylated alkenes
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
Direct difunctionalization of alkenes with sulfinic acids and NBS leading to β-bromo sulfones
作者:Wei Wei、Xiaoxia Liu、Daoshan Yang、Ruimei Dong、Ying Cui、Fei Yuan、Hua Wang
DOI:10.1016/j.tetlet.2015.02.043
日期:2015.4
A new and metal-free method has been developed for the synthesis of β-bromo sulfones through the direct difunctionalization of alkenes with sulfinic acids and NBS. This protocol provides a simple, convenient, and efficient approach to various β-bromo sulfones in moderate to good yields with excellent selectivity, and especially does not require any catalyst or additive.