Poly[styrene(iodosodiacetate)]-Promoted Ring Expansion Reaction of 1-Alkynylcycloalkanols: A Novel Synthesis of (<i>Z</i>)-2-(1-Iodo-1-organyl)methylenecycloalkanones
作者:Xian Huang、Jiang-Min Chen
DOI:10.1055/s-2004-831214
日期:——
The ringexpansion reaction of 1-alkynylcycloalkanols with poly[styrene(iodosodiacetate)] and iodine affords (Z)-2-(1-iodo-1-organyl)methylenecycloalkanones in moderate to good yields.
Catalytic alkynylation of diverse ketones and aldehydes using nonmetallic benzyltrimethylammonium hydroxide or a basic resin of the hydroxide type in DMSO is described. Aliphatic or alicyclic carbonyl partners gave satisfactory results, whereas aromatic ones afforded products with low yields. When aromatic aldehydes were reacted with phenylacetylene, enones such as chalcone derivatives were obtained in place of ynols. These organobase-catalyzed systems provide a practical nonmetallic protocol for C-C bond formation.