Controlled Garegg Conditions for Selective Iodination on Pyranose Templates
作者:Ana-Catarina Simao、Sandrina Silva、Amelia P. Rauter、Patrick Rollin、Arnaud Tatibouët
DOI:10.1002/ejoc.201001325
日期:2011.4
Regio- and stereoselective iodinations under controlled Garegg conditions were performed on vicinaldiols and contiguous triols located on pyranose templates. P- D -Fructo- or psicopyranose-based diols were selectively iodinated at C-5 or C-4, respectively, to afford the L -sorbo or D -tagato iodohydrins. In contrast, the related triols only underwent selective iodination at C-5. Application of the
Electronic Probing of Ketone Catalysts for Asymmetric Epoxidation. Search for More Robust Catalysts
作者:Hongqi Tian、Xuegong She、Yian Shi
DOI:10.1021/ol000385q
日期:2001.3.1
[structure: see text]. Ketones with a fused oxazolidinone were synthesized and investigated to determine the electronic effect of the substituents at alpha-positions of ketonecatalysts on the Baeyer-Villiger oxidation and catalytic properties for asymmetricepoxidation. These newketones give high yields and ee's with only 1-5 mol % catalyst. The current studies further show that the electronic effect