Vinylogous sulfonates as radical acceptors for the stereoselective synthesis of cyclic ethers
摘要:
Treatment of the E-vinylogous sulfonates Ice-g with tris(trimethylsilyl)silane and triethylborane, in the presence of air, at room temperature furnished the cyclic ethers 2/3a-g in 34-99% yield with greater than or equal to 8 : 1 cis-diastereoselectivity. (C) 1997 Elsevier Science Ltd.