l-Proline-catalyzed intramolecular cyclization of 5-hydroxypentene to β-halogenated tetrahydrofuran
摘要:
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.