A series of 5-hydroxypentenes was synthesized from the reaction mixture of Mg powder, 1,2-dibromoethane, 4-bromobutene and aldehydes in THF under ultrasound. This sonochemicalBarbierreaction provides a simple and alternative method for preparation of 5-hydroxypentene instead of the allylating reagent with epoxide.
A series of beta-bromo- and beta-iodotetrahydrofurans was synthesized from the reaction mixture of 5-hydroxypentene, L-proline, NBS (or I-2) in THF at 0 degrees C for 10 min. This L-proline-catalyzed intramolecular cyclization provides a simple and efficient method for the preparation of P-halogenated tetrahydrofuran. (c) 2007 Elsevier Ltd. All rights reserved.