ol0509080_si_001.cif (32.72 kB)
Diastereoselective Synthesis of Tetrahydrofurans via Reaction of γ,δ-Epoxycarbanions with Aldehydes†
dataset
posted on 2005-07-07, 00:00 authored by Mieczysław Ma̧kosza, Michał Barbasiewicz, Dariusz KrajewskiHydroxymethyl-substituted tetrahydrofurans were prepared with high diastereoselectivity by reaction of the carbanion derived from 3,4-epoxybutyl
phenyl sulfone with aldehydes in the presence of a mixture of lithium and potassium tert-butoxides. Initial formation of aldol-type adducts is
a nondiastereoselective but reversible process; thus, subsequent formation of one main diastereoisomer is controlled by the relative rates of
cyclization. The configuration of the carbon stereocenter at the oxirane ring is inverted in the course of the SN2 process, and two new centers
are created diastereoselectively.
History
Usage metrics
Categories
Keywords
adductpotassium tertpresencebutoxideAldehydeoxirane ringDiastereoselective SynthesisS N 2 processcarbanionTetrahydrofurancyclizationEpoxycarbanionnondiastereoselectivesulfonealdehydediastereoisomerlithiummixturetetrahydrofuranphenyldiastereoselectivityepoxybutylInitial formationconfigurationcarbon stereocenterdiastereoselectively
Licence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC