Modified cinchona alkaloid-catalysed enantioselective [4+4] annulations of cyclobutenones and 1-azadienes
作者:Bo Jiang、Wei Du、Ying-Chun Chen
DOI:10.1039/d0cc02836c
日期:——
An asymmetric [4+4] annulation reaction between β-substituted cyclobutenones and diverse 1-azadienes is developed under the catalysis of modified cinchona alkaloids.
在改良的金鸡纳碱催化下,发展了一种β-取代环丁酮和多种1-氮杂烯之间的不对称[4+4]环加成反应。
Rh(II)-catalyzed [2,3]-sigmatropic rearrangement of sulfur ylides derived from N-tosylhydrazones and sulfides
作者:Yuye Li、Zhongxing Huang、Xinhu Wu、Peng-Fei Xu、Jing Jin、Yan Zhang、Jianbo Wang
DOI:10.1016/j.tet.2012.03.032
日期:2012.7
In this paper, Rh2(OAc)4-catalyzed [2,3]-sigmatropic rearrangement of sulfur ylides derived from N-tosylhydrazones and sulfides is reported. A series of tosylhydrazones derived from aldehydes were successfully used for [2,3]-sigmatropic rearrangement by reaction with either allylic phenyl sulfides or propargyl phenyl sulfides. The reaction conditions were optimized and afforded the products in moderate
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.