A sulfur-containing diselenide as an efficient chiral reagent in asymmetric selenocyclization reactions
摘要:
Treatment of the di-2-[(IS)-1-(methylthio)ethyl]phenyl diselenide with bromine and silver triflate afforded the corresponding selenyl triflate which was used in situ as a strongly electrophilic selenium reagent to effect the asymmetric synthesis of oxygen- or nitrogen-containing heterocycles. Cyclic ethers, lactones, lactams or N-protected pyrrolidines have been prepared in good yield with complete regioselectivity and high diastereoselectivity. (C) 2001 Elsevier Science Ltd. All rights reserved.
Synthesis of CHF<sub>2</sub>-Containing Heterocycles through Oxy-difluoromethylation Using Low-Cost 3D Printed PhotoFlow Reactors
作者:Jinlei Zhang、Elias Selmi-Higashi、Shen Zhang、Alexandre Jean、Stephen T. Hilton、Xacobe C. Cambeiro、Stellios Arseniyadis
DOI:10.1021/acs.orglett.3c03997
日期:2024.4.12
We report here a highly straightforward access to a variety of CHF2-containing heterocycles, including lactones, tetrahydrofurans, tetrahydropyrans, benzolactones, phthalanes, and pyrrolidines, through a visible light-mediated intramolecular oxy-difluoromethylation under continuous flow. The method, which relies on the use of readily available starting materials, low-cost 3D printed photoflow reactors