Sequential Oxidation-Prins Reaction Processes Induced by the Same Iron Salt: Direct Access to 2-Aryl-4-Chloro-Tetrahydropyrans from Benzyl Alcohols
作者:Fabienne Fache、Olivier Piva、Mickaël Muselli
DOI:10.1055/s-0033-1339306
日期:——
A clay-supported iron(III) nitrate (Clayfen) was used as a stoichiometric reagent to first oxidize benzylic alcohols. The aldehydes thus obtained were converted in situ into tetrahydropyrans by way of a Prins cyclization induced by iron species already present in the media.
An efficientsynthesis of 2-aryl-4-chloro-tetrahydropyrans has been accomplished from benzyl chlorides and homoallylic alcohols using FeCl3 as a promoter through a sequential oxidation/Prinscyclization in high yields. This is the first report on the use of benzyl chlorides as surrogates for aldehydes in the Prinscyclization.