Allyl sulfones construction via copper catalysis from α-methylstyrene derivatives and sulfonyl chlorides
作者:Lixia Liu、Chengming Wang
DOI:10.1016/j.tetlet.2021.153553
日期:2022.1
Allyl sulfones are synthesized via Cu-catalyzed ligand-free regioselective sulfonylation reaction from easily obtained α-methylstyrene derivatives and sulfonyl chlorides. This redox-neutral protocol also features a low-cost metal catalyst, broad substrate scope, good functional group tolerance and could be smoothly amplified to a gram scale. The allylic sulfone products can be used in diverse radical
Herein, we report an unprecedented regiospecific oxidative Mizoroki-Heck type reaction for the synthesis of α-difluoromethyl homoallylic alcohols. The reaction shows broad substrate scopes and high functional group tolerance. Late-stage functionalization of complex biologically active molecules demonstrates the synthetic potential of this transformation. Mechanistic study supports the involvement of
Iodothiocyanation/Nitration of Allenes with Potassium Thiocyanate/Silver Nitrite and Iodine
作者:Xiaodong Yang、Yue She、Ya Chong、Huichun Zhai、He Zhu、Baohua Chen、Guosheng Huang、Rulong Yan
DOI:10.1002/adsc.201600304
日期:2016.10.6
Direct strategies for the iodothiocyanation and iodonitration of allenes have been developed. In this process, potassium thiocyanate/silver nitrite and molecular iodine are used as the source of SCN, ONO2 and iodine to provide the desired products in moderate to good yields with high stereoselectivity.
A convenient access to allylic triflones with allenes and triflyl chloride in the presence of (EtO)<sub>2</sub>P(O)H
作者:Jixiang Ni、Yong Jiang、Zhenyu An、Jingfeng Lan、Rulong Yan
DOI:10.1039/c9cc03096d
日期:——
A simple method for the preparation of allylic triflones from allenes and triflyl chloride in the presence of (EtO)2P(O)H has been developed. The features of this reaction are catalyst-free and simple starting substrates. This method tolerates diverse functional groups and substituted allylic triflones are obtained in moderate to good yields.
Synergistic Oxidative Coupling–[3+2] Cyclization of Quinones with Olefins Promoted by Cerium(IV) Sulfate Tetrahydrate
作者:Xing Huo、Jizhong Fang、Lige Xu、Bowen Fang
DOI:10.1055/s-0036-1588781
日期:2017.7
A cerium(IV) sulfate tetrahydrate promoted oxidativecyclization of quinones with olefins is developed. It proceeds through a tandem [3+2]-cyclization–oxidative coupling–[3+2]-cyclization process, in which tetrahydrobenzodifurans were conveniently constructed in high yields. Moreover, this method exhibits a good functional-group tolerance and scalability.