Stereoselective synthesis of tetrahydrofurans and tetrahydropyrans by Ni(0) promoted tandem cyclization-carbonylation
作者:Antonio Delgado、Amadeu Llebaria、Francisco Camps、Josep M. Moretó
DOI:10.1016/s0040-4039(00)76727-x
日期:1994.6
Reaction of different vinyl bromides (1a-3a), beating 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, TIOAc, Cs2CO3, and KOCOCF3.