We here report glycosyl sulfoxides appended with an aryl iodide moiety as readily available, air and moisture stable precursors to glycosyl radicals. These glycosyl sulfoxides could be converted to glycosyl radicals by way of a rapid and efficient intramolecular radical substitution event. The use of this type of precursors enabled the synthesis of various complex C‐linked glycoconjugates under mild
The hydroxypolyfluoroalkylation of alkenes is reported, wherein the intrinsic aldehyde/ketone-gem-diol equilibrium and photocatalytic phosphine-mediated deoxygenation play key roles. A range of electron-deficient alkenes are compatible in this transformation, thus leading to structurally varied bis(trifluoromethyl)carbinols in moderate to excellent yields.
Direct Photoexcitable Iodomethylborate Enabling Cyclopropanation of Reactive Alkenes
作者:Rikako Nakamura、Yuto Sumida、Hirohisa Ohmiya
DOI:10.1246/bcsj.20220112
日期:2022.7.15
Radical-mediated cyclopropanation tool for reactive alkenes including dehydroamino acids (DHAAs) has been developed based on directly photoexcitable borate generating iodomethyl radical under visible light irradiation. The borate at the excited state serves as a strong single electron reductant. Therefore, this photoexcitable borate offers a simple protocol for cyclopropanation of DHAAs to forge m
Die Erfindung betrifft Adsorbentien auf Basis optisch aktiver Poly(meth)acrylsäureamide, die zur Trennung von racemischen Gemischen in ihre optischen Antipoden verwendet werden können, bei denen diese Amide in an Kieselgel gebundener Form vorliegen.