Lewis Acidic Chloroaluminate Ionic Liquids: Novel Reaction Media for the Synthesis of 4-Chloropyrans
作者:Jhillu S. Yadav、Basi V. S. Reddy、Maddi Sridhar Reddy、Namelikonda Niranjan、Attaluri R. Prasad
DOI:10.1002/ejoc.200210638
日期:2003.5
1-n-Butyl-3-methylimidazolium chloroaluminate [bmim]Cl·AlCl3 (N = 0.56−0.67) ionicliquid has been employed as an alternative reaction medium to conventional acid catalysts for Prins cyclizations, to produce 4-chlorotetrahydropyran derivatives in excellent yields and in short reaction times. The ionicliquid plays a dual role as both catalyst and solvent, providing a rapid and efficient route to the
Synthesis of 4-halotetrahydropyrans from allylsilanes and carbonyl compounds in the presence of lewis acids
作者:Laura Coppi、Alfredo Ricci、Maurizio Taddei
DOI:10.1016/s0040-4039(00)95890-8
日期:1987.1
An unexpected behavior of the reaction of allylsilanes and carbonylcompounds allowed the stereospecific preparation of differently substituted 4-halotetrahydropyrans with an “all cis” configuration.