Radical Fragment Coupling Route to Geminal Bis(boronates)
作者:Qi Huang、Samir Z. Zard
DOI:10.1021/acs.orglett.8b02235
日期:2018.9.7
atom abstraction and delivers a vast array of highly functional geminal bis(boronates). The ability to assemble geminal bis(boronates) bearing polar functional groups not readily obtained through existing methods is particularly noteworthy. This approach also opens up access to geminal bis(boronyl) cyclopropanes and geminal bis(boronyl) tetrahydroquinolines.
A direct, versatile route to functionalized trialkoxysilanes
作者:Béatrice Quiclet-Sire、Yuuki Yanagisawa、Samir Z. Zard
DOI:10.1039/c3cc48570f
日期:——
The peroxide initiated radical addition of dithiocarbonates (xanthates) to trialkoxy vinylsilanes leads to functionalized trialkoxysilanes. Prior addition of the dithiocarbonates to an alkene before reaction with the vinylsilane can be used to increase the complexity of the final product.
A versatile radical based approach to O-alkylated hydroxylamines and oximes
作者:Béatrice Quiclet-Sire、Daniel Woollaston、Samir Z. Zard
DOI:10.1016/j.tet.2008.08.113
日期:2008.12
O-Alkylhydroxylamines, often used for the preparation of bioconjugates, can be readily obtained by radical addition to suitable O-alkenylhydroxylamine derivatives. In the case of N-Boc-O-allylhydroxylamine, the addition is unexpectedly followed by elimination resulting in an overall allylation of the radical species. (C) 2008 Elsevier Ltd. All rights reserved.
Schotte, Arkiv foer Kemi, 1953, vol. 5, p. 533,540
作者:Schotte
DOI:——
日期:——
Rhodamine spirolactam sensors operated by sulfur-cooperated metal complexation
作者:Gisuk Heo、Dahye Lee、Chi Gwan Kim、Jung Yun Do
DOI:10.1016/j.saa.2017.07.019
日期:2018.1
New rhodamine Schiff base sensors were developed to improve selective sensing by introducing sulfide, ester, and dithiocarbonate groups, as well as using ketones coupled to rhodamine-hydrazine. Metal sensing proceeded through the 1:1 complexation of the metal ion for most sensors in the presence of Cu2+ and Hg2+. A sensor carrying a dithiocarbonate group responded selectively to Hg2+ showing a strong colorimetric change and intense fluorescence. The association constants of the sensors were determined from a linear plot performed at micro-molar concentrations to afford values in the range of 10(4). Sensing was interrupted at the initial time of Hg2+ exposure due to the isomerization of imine and preferential metal bonding of two dithiocarbonate groups regardless of the main structure of rhodamine. The sensors exhibited the reversible and reproducible performance for Hg2+ sensing. (C) 2017 Elsevier B.V. All rights reserved.