An efficient and versatile method for the stereospecific construction of α,ω-cis- and α,ω-trans-disubstituted eight- and nine-membered cyclic ethers was developed. Cyclization of the hydroxy epoxides promoted by Eu(fod)3proceeded via an SN2 process and exo mode to provide the corresponding cyclic ethers in excellent yields. © 2003 Elsevier Science Ltd. All rights reserved.
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