Au-Catalyzed Oxidative Arylation: Chelation-Induced Turnover of <i>ortho</i>-Substituted Arylsilanes
作者:Matthew P. Robinson、Guy C. Lloyd-Jones
DOI:10.1021/acscatal.8b02302
日期:2018.8.3
ortho-Substituted aryl silanes have previously been found to undergo much slower Au-catalyzed intermolecular arylation than their m,p-substituted isomers, with many examples failing to undergo turnover at all. A method to indirectly quantify the rates of C–Si auration of o-substituted aryl silanes, under conditions of turnover, has been developed. All examples are found to undergo very efficient C–Si
Directed <i>ortho</i> Metalation-Based Methodology. Halo-, Nitroso-, and Boro-Induced <i>ipso-</i>Desilylation. Link to an <i>in situ</i> Suzuki Reaction
作者:Zhongdong Zhao、Victor Snieckus
DOI:10.1021/ol0506563
日期:2005.6.1
[reaction: see text] Treatment of DoM-derived silylated aromatics 2-4 under standard electrophilic halogenation conditions cleanly affords ipso-desilyation products 5-7, while nitration of methoxy-substituted analogues 8, 9 leads to non-ipso isomers 10, 12 and 11, 13, controlled by a silicon steric effect. Sequential ipso-borodesilylation of 2a, 3a, and 20 followed by treatment with aryl halides under
Selective <i>Ortho</i> and Benzylic Functionalization of Secondary and Tertiary <i>p</i>-Tolylsulfonamides. <i>Ipso</i>-Bromo Desilylation and Suzuki Cross-Coupling Reactions
作者:Stephen L. MacNeil、O. B. Familoni、Victor Snieckus
DOI:10.1021/jo001402s
日期:2001.6.1
Kinetic vs thermodynamic deprotonation studies on secondary and tertiary sulfonamides 1 and 2 using n-BuLi have been carried out. While both 1 and 2 show kinetic ortho-metalation, thermodynamic conditions lead to ortho and benzylic deprotonation, respectively (Figures 1 and 2). Metalation of 1 using the n-BuLi/KOtBu superbase led to regioselective benzylic metalation (Figure 4); LDA deprotonation was