Copper(I)-Catalyzed Alkylation of Polyfluoroarenes through Direct CH Bond Functionalization
作者:Shuai Xu、Guojiao Wu、Fei Ye、Xi Wang、Huan Li、Xia Zhao、Yan Zhang、Jianbo Wang
DOI:10.1002/anie.201412450
日期:2015.4.7
The copper(I)‐catalyzed alkylation of electron‐deficient polyfluoroarenes with N‐tosylhydrazones and diazo compounds has been developed. This reaction uses readily available starting materials and is operationally simple, thus representing a practical method for the construction of C(sp2)C(sp3) bonds with polyfluoroarenesthroughdirectCHbondfunctionalization. Mechanistically, copper(I) carbene
Cu(I)/Chiral Bisoxazoline-Catalyzed Enantioselective Sommelet–Hauser Rearrangement of Sulfonium Ylides
作者:Shu-Sen Li、Jianbo Wang
DOI:10.1021/acs.joc.0c01590
日期:2020.10.2
asymmetric thia-Sommelet–Hauser rearrangement of sulfonium ylides remains a great challenge due to its multistep reaction mechanism involving metal carbene formation, proton transfer, and [2,3]-sigmatropic rearrangement. In particular, the key problem of such reactions is the differentiation of the enantiotopic lone pair electrons of sulfur, which generates the sulfonium ylide intermediate bearing chirality
Correction to “Oxazaborolidinium Ion-Catalyzed Cyclopropanation of α-Substituted Acroleins: Enantioselective Synthesis of Cyclopropanes Bearing Two Chiral Quaternary Centers”
作者:Lizhu Gao、Geum-Sook Hwang、Do Hyun Ryu
DOI:10.1021/jacs.1c03211
日期:2021.4.21
reversed. The revised results were confirmed by NOE experiments and comparison of the optical rotation data with reported values after transformation. The corrected Table 3 is presented below. This correction does not affect the conclusion of the paper. Determined by 1H NMR analysis of the crude reaction mixture. Isolated yield. The ee of the product was determined by chiral HPLC or GC. Yield of the trans
第20709和20710页。在该论文的已发布版本中,2w和2x的反式:顺式比例相反。通过NOE实验以及将旋光度数据与转换后报告的值进行比较,证实了修改后的结果。校正后的表3如下所示。此更正不影响本文的结论。通过1 H NMR分析粗反应混合物确定。孤立的产量。产物的ee通过手性HPLC或GC测定。反式异构体的收率由1计算分离的异构体混合物的1 H NMR分析。以43%的产率和94%的ee获得顺式异构体。获得了作为主要产物的顺式异构体,并且通过对分离的异构体混合物的1 H NMR分析来计算顺式异构体的产率。在提供实验细节的支持信息文件中,2w和2x的绝对配置被错误地绘制为(1 R,2 R)(第S26–S28页)。此处提供了经过更正的文件,该文件描述了(1 S,2 R)配置。可从https://pubs.acs.org/doi/10.1021/jacs.1c03211免费获得支持信息。 实验程序
Construction of stereodefined 1,1,2,2-tetrasubstituted cyclopropanes by acid catalyzed reaction of aryldiazoacetates and α-substituted acroleins
Michael-initiated ring closure of aryldiazoacetates and α-substituted acroleins under acid catalysis offers a unique opportunity for the stereoselective formation of various tetrasubstituted cyclopropanes.
Catalytic asymmetric trifluoromethylthiolation via enantioselective [2,3]-sigmatropic rearrangement of sulfonium ylides
作者:Zhikun Zhang、Zhe Sheng、Weizhi Yu、Guojiao Wu、Rui Zhang、Wen-Dao Chu、Yan Zhang、Jianbo Wang
DOI:10.1038/nchem.2789
日期:2017.10
into a variety of molecules, there remain significant challenges regarding the enantioselective synthesis of SCF3-containing compounds. Here, an asymmetric trifluoromethylthiolation that proceeds through the enantioselective [2,3]-sigmatropicrearrangement of a sulfonium ylide generated from a metal carbene and sulfide (Doyle–Kirmse reaction) has been developed using chiral Rh(II) and Cu(I) catalysts