such heterocycles is the (3 + 2) cycloaddition reaction of benzynes with 1,3-dipolar compounds. However, the reactions of unsymmetrically substituted benzynes generally show low selectivity and hence yield mixtures of two regioisomers. In this paper, we describe the synthesis of both regioisomers of multisubstituted benzo-fused azole derivatives such as benzotriazoles, 1H-indazoles, and benzo[d]isoxazoles
Bifunctional tertiary amine-squaramide catalyzed asymmetric catalytic 1,6-conjugate addition/aromatization of para-quinone methides with oxindoles
作者:Yu-Hua Deng、Xiang-Zhi Zhang、Ke-Yin Yu、Xu Yan、Ji-Yuan Du、Hanmin Huang、Chun-An Fan
DOI:10.1039/c5cc10502a
日期:——
Asymmetric catalytic 1,6-addition of p-QMs with racemic oxindoles under the bifunctionalcatalysis of C2-symmetric dimeric Cinchona-derived squaramides is described. This tertiary amine-squaramide catalzyed reaction provides a diastereoselective and enantioselective approach...
Continuous-Flow Synthesis of Trimethylsilylphenyl Perfluorosulfonate Benzyne Precursors
作者:Boris Michel、Michael F. Greaney
DOI:10.1021/ol500959e
日期:2014.5.16
2-(Trimethylsilyl)phenyl perfluorosulfonated aryne precursors may now be accessed using flow chemistry, enabling the fast preparation of pure compounds with no requirement for low temperature lithiation or column chromatography. The process has been adapted to novel nonaflate precursors, utilizing the cheaper and more user-friendly nonaflyl fluoride reagent. The resultant nonaflates are shown to successfully
Stable 2-(trimethylsilyl)phenyl trimethylsilyl ethers, readily obtained from the corresponding halogenated phenols in two steps, were identified as novel benzyne precursors. These species were converted to benzynes by a domino reaction of O-desilylation, O-nonaflylation, and β-elimination under mild conditions using nonafluorobutanesulfonyl fluoride (NfF) and tetrabutylammonium triphenyldifluorosilicate
Mise en evidence de la formation de cations aryles dans la solvolyse de trifluoromethanesulfonates d'aryle par introduction de groupes trimethylsilyles et/ou t-butyles comme substituants ortho dans les groupes aryles
Mise en evidence de la形成de la形成de cations dans la solvolyse de trifluoromethanesulfonates d'aryle par Introduction de groupes trimethylsilyles et/out t-butyles comme substituants ortho dans les groupes aryles