Stereoselective Synthesis of Fully Substituted β-Lactams via Metal–Organo Relay Catalysis
作者:Long Chen、Kai Wang、Ying Shao、Jiangtao Sun
DOI:10.1021/acs.orglett.9b01255
日期:2019.5.17
A novel three-component reaction of N-hydroxyanilines, enynones, and diazo compounds has been developed via a metal–organo relay catalysis, providing highly functionalized β-lactams containing two quaternary carbon centers in good yields and with excellent diastereoselectivities. This protocol features a sequential reaction of Rh-catalyzed imine formation, Wolff rearrangement, and benzoylquinine-catalyzed
Catalytic Generation of Zinc Carbenes from Alkynes: Zinc-Catalyzed Cyclopropanation and SiH Bond Insertion Reactions
作者:Rubén Vicente、Jesús González、Lorena Riesgo、Javier González、Luis A. López
DOI:10.1002/anie.201203914
日期:2012.8.6
Think zinc: Synthetically relevant zinc(II) carbenes are catalytically generated fromalkynes (see scheme). This new approach allows zinc‐catalyzed cyclopropanation and SiHbondinsertionreactions to generate the corresponding cyclopropylfurans or silane derivatives. The structure of the key carbene intermediate was studied using theoretical methods.
Preparation of 4-(Nitromethyl)furan Derivatives and Their Application in the Syntheses of Bis(furan-2-yl)oximes
作者:Yinbo Wan、Yang Zhu、Haiyun Peng、Guisheng Deng
DOI:10.1021/acs.joc.1c02359
日期:2022.1.7
An efficient method for the preparation of tetrasubstituted furans, which contains a nitromethyl group at the 4-position, has been developed. The applications of 4-(nitromethyl)furans on the synthesis of highly functionalized bis(furyl)oxime were explored for the first time.
Chemo‐ and Enantioselective Insertion of Furyl Carbene into the N−H Bond of 2‐Pyridones
作者:Kai Wang、Ziye Liu、Guangyang Xu、Ying Shao、Shengbiao Tang、Ping Chen、Xinhao Zhang、Jiangtao Sun
DOI:10.1002/anie.202104708
日期:2021.7.26
Asymmetric carbeneinsertion reactions represent one of the most important protocols to construct carbon–heteroatom bonds. The use of donor–acceptor diazo compounds bearing an ester group is however a prerequisite for achieving high enantioselectivity. Herein, we report a chemo- and enantioselective formal N−H insertion of 2-pyridones that has been accomplished for the first time with enynones as the