Abstract
Reaction of different vinyl bromides ( 1a–3a), bearing phenyl substituted alkenyloxyalkyl groups, with Ni(CO) 4 affords the corresponding substituted cyclic ethers 1b–3b in moderate to good yields and high diastereoselectivity. In the cyclization of 1a, the stereoselectivity of the process can be reversed by the use of additives, such as KOAc, TlOAc, Cs 2CO 3, and KOCOCF 3.
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