Lipshutz-type bis(amido)argentates for directed <i>ortho</i> argentation
作者:Noriyuki Tezuka、Keiichi Hirano、Andrew J. Peel、Andrew E. H. Wheatley、Kazunori Miyamoto、Masanobu Uchiyama
DOI:10.1039/c9sc06060j
日期:——
aromatic functionalization via unprecedented directed ortho argentation (DoAg). X-Ray crystallographic analysis showed that 3 takes a structure analogous to that of the corresponding Lipshutz cuprate. DoAg with this TMP-Ag-ate afforded multifunctional aromatics in high yields in processes that exhibited high chemoselectivity and compatibility with a wide range of functional groups. These included organometallics-
双(酰胺基)银盐(TMP)2 Ag(CN)Li 2(3,TMP-Ag-酸盐; TMP = 2,2,6,6-四甲基哌啶子基)被设计为通过空前的定向原位化学键进行化学选择性芳族官能化的工具(D o Ag)。X射线晶体学分析表明3具有与相应的Lipshutz铜酸盐类似的结构。d Ø具有这种TMP-Ag-酸酯的Ag在具有高化学选择性和与各种官能团相容性的工艺中,以高收率提供了多官能芳烃。这些包括对有机金属和过渡金属敏感的取代基,例如甲酯,醛,乙烯基,碘,(三氟甲磺酰基)氧基和硝基。白蚁类药物与各种亲电试剂显示出良好的反应性。硫属元素(S,Se和Te)的安装和偶氮偶合反应也有效进行。
Asymmetric Deoxygenative Alkynylation of Tertiary Amides Enabled by Iridium/Copper Bimetallic Relay Catalysis
作者:Zhaokun Li、Feng Zhao、Wei Ou、Pei‐Qiang Huang、Xiaoming Wang
DOI:10.1002/anie.202111029
日期:2021.12.13
An Ir/Cu bimetallicrelaycatalysis was developed to achieve the challenging asymmetricdeoxygenativealkynylation of inert amides under mild conditions, affording a series of synthetically important chiral propargylamines in high yields with good to excellent enantioselectivities.
Deprotonative directed ortho cupration of aromatic/heteroaromatic C-H bond and subsequent oxidation with t-BuOOH furnished functionalized phenols in high yields with high regio- and chemoselectivity. DFT calculations revealed that this hydroxylation reaction proceeds via a copper (I → III → I) redox mechanism. Application of this reaction to aromatic C-H amination using BnONH2 efficiently afforded
芳族/杂芳族 CH 键的去质子定向邻铜化和随后用 t-BuOOH 氧化以高产率和高区域选择性和化学选择性提供官能化酚。DFT 计算表明,这种羟基化反应是通过铜 (I → III → I) 氧化还原机制进行的。将该反应应用于使用 BnONH2 的芳族 CH 胺化有效地提供了相应的伯苯胺。这些反应显示出广泛的范围和良好的官能团兼容性。还展示了这些转化的催化版本。
N-Heterocyclic Carbene Catalyzed Umpolung of Styrenes: Mechanistic Elucidation and Selective Tail-to-Tail Dimerization
作者:Michael Schedler、Nathalie E. Wurz、Constantin G. Daniliuc、Frank Glorius
DOI:10.1021/ol501256d
日期:2014.6.6
N-heterocyclic carbenes (NHCs) and styrenes yields alkyl-substituted azolium salts, which are able to form nucleophilic deoxy Breslow intermediates by simple deprotonation. This hitherto unknown reaction of NHCs represents a new way to generate deoxy Breslow intermediates and paves the way for the selective NHC-catalyzed tail-to-tail homodimerization of styrenes. This reaction significantly broadens