Hydroalumination-Brominolysis of Vinylalkynols: A Novel Entry to (E)- and (Z)-Bromoalkadienols, and Bromoallenols
作者:Hovhannes Gharibian、Gulnara Palikyan、Shaliko H. Badanyan、Kevin Paulsen、Gagik G. Melikyan
DOI:10.1002/1522-2675(20001220)83:12<3291::aid-hlca3291>3.0.co;2-p
日期:2000.12.20
Hydroalumination-brominolysis of vinylacetylenic alcohols 1-4 provides a novel entry to synthetically useful (E)- and (Z)-bromoalkadienols, and bromoallenols, which are otherwise hardly accessible. An electrophilic cleavage of cyclic intermediate A follows competing mechanistic pathways, giving rise to isomeric (Z)-bromodienols 5-8 and allenic alcohols 9-12. The latter are stereoselectively converted to (E)-bromoalkadienols 13-16 by CuBr-catalyzed anionotropic rearrangement.