Synthesis of Chiral Sulfonyl Lactones via Copper-Catalyzed Asymmetric Radical Reaction of DABCO⋅(SO<sub>2</sub>
)
作者:Yang Wang、Lingling Deng、Jie Zhou、Xiaochen Wang、Haibo Mei、Jianlin Han、Yi Pan
DOI:10.1002/adsc.201701532
日期:2018.3.20
work, an asymmetriccopper‐catalyzed radical multi‐component cascade reaction of an unsaturated carboxylic acid, aryldiazonium tetrafluoroborate, and DABCO⋅(SO2)2 (DABSO) has been developed for the enantioselective synthesis of sulfonyl lactones. In this reaction, this SO2 surrogate, DABSO was applied for the first time in the construction of chiral compounds. This multiple‐step asymmetric radical reaction
Oxidative Mizoroki-Heck-Type Reaction of Arylsulfonyl Hydrazides for a Highly Regio- and Stereoselective Synthesis of Polysubstituted Alkenes
作者:Fu-Lai Yang、Xian-Tao Ma、Shi-Kai Tian
DOI:10.1002/chem.201103671
日期:2012.2.6
hydrazides have been identified as synthetically useful aryl sources for the Pd(OAc)2 catalyzed oxidative Mizoroki–Heck‐type reaction under molecular oxygen to provide a convenient access to polysubstituted alkenes in a highly regio‐ and stereoselective manner (see scheme). The reaction well tolerates various functional groups such as alkoxy, halo, alcohol, carboxylic acid, ester, amide, sulfonamide, and
A convenient and efficient synthesis of sulfones from sulfinates and aryl halides was developed. The reaction occurred under UV irradiation without transition metal catalyst or photocatalyst. A radical pathway via single‐electron transfer (SET) of electron donor‐acceptor (EDA) complex was proposed based on UV‐vis spectroscopy, radical inhibiting and trapping experiments.
Cross-Coupling of Aryl/Alkenyl Ethers with Aryl Grignard Reagents through Nickel-Catalyzed CO Activation
作者:Lan-Gui Xie、Zhong-Xia Wang
DOI:10.1002/chem.201003731
日期:2011.4.26
achieved through the cleavage of the sp2 CO bond of aryl/alkenyl ethers catalyzed by a nickel complex, and by using Grignard reagents as nucleophiles (see scheme). This method displays a broad substrate scope and leads to good to excellent yields of the aryl–aryl or alkenyl–aryl cross‐coupling products.
Pd-Catalyzed C═C Double-Bond Formation by Coupling of <i>N</i>-Tosylhydrazones with Benzyl Halides
作者:Qing Xiao、Jian Ma、Yang Yang、Yan Zhang、Jianbo Wang
DOI:10.1021/ol901876w
日期:2009.10.15
Pd-catalyzed reaction of N-tosylhydrazones with benzylhalides affords di- and trisubstituted olefins in high yields with excellent stereoselectivity. This coupling reaction is supposed to proceed through a migratory insertion of Pd carbene species.