Palladium-Catalyzed Carbene Coupling Reactions of Cyclobutanone <i>N</i>-Sulfonylhydrazones
作者:Xiaoqin Ning、Yongke Chen、Fangdong Hu、Ying Xia
DOI:10.1021/acs.orglett.1c03052
日期:2021.11.5
Described herein are the palladium-catalyzed cross-couplingreactions of cyclobutanone-derived N-sulfonylhydrazones with aryl or benzyl halides, suggesting that the metal carbene process and β-hydride elimination can smoothly occur in strained ring systems. Structurally diversified products including cyclobutenes, methylenecyclobutanes, and conjugated dienes are selectively afforded in good to excellent
Cobalt‐Catalyzed Asymmetric Sequential Hydroboration/Isomerization/Hydroboration of 2‐Aryl Vinylcyclopropanes
作者:Chenhui Chen、Hongliang Wang、Tongtong Li、Dongpo Lu、Jiajing Li、Xie Zhang、Xin Hong、Zhan Lu
DOI:10.1002/anie.202205619
日期:2022.7.25
Chiral 1,5-bis(boronates) were synthesized via an enantioselective cobalt-catalyzed sequential hydroboration/isomerization/hydroboration of vinylcyclopropanes through a trisubstituted alkene intermediate. These chiral 1,5-bis(boronates) were further converted into chiral 1,2,5-triaryl alkanes by an iterative Suzuki–Miyaura cross-coupling reaction with aryl halides.
Nickel‐Catalyzed Tunable Enantioconvergence and Kinetic Resolution in the Coupling of Tertiary Cyclobutenols with Arylboroxines
作者:Xufei Yan、Yulei Zhu、Ying Xia
DOI:10.1002/anie.202304462
日期:2023.6.19
enantioconvergent or a kinetic resolution step was used in the reaction of tertiary cyclobutenols with arylboroxines under a Ni/modified SPINOL catalytic system. This reaction allows the direct use of free hydroxyl groups as leaving groups while the strained ring remains untouched and provides enantioenriched cyclobutenes having a tertiary hydroxyl or an all-carbon quaternary stereocenter.