Benzocycloheptynedicobalt Complexes by Intramolecular Nicholas Reactions
作者:James R. Green、Yu Ding
DOI:10.1055/s-2004-837215
日期:——
Lewis acid mediated intramolecular Nicholas reactions of aryl (Z)-enyne propargyl acetate-Co2(CO)6 complexes 1 afford benzocycloheptenyne-Co2(CO)6 complexes 2 and their heterocyclic analogues.
[reaction: seet text] Two synthetic routes to several (Z)-polyaromatic and heteroaromatic substituted vinylacetylenes are described. The nature of aryl- or heteroaryl-substituted carboxaldehyde used as starting material dictated the choice of Wittig salt employed. A very attractive way to construct polyaromatic and pyridine-containing enynes is the reaction of polyaromatic and pyridine-containing aldehydes