Au(I)- and Pt(II)-Catalyzed Cycloetherification of ω-Hydroxy Propargylic Esters
作者:Jef K. De Brabander、Bo Liu、Mingxing Qian
DOI:10.1021/ol8008107
日期:2008.6.1
Depending on the nature of the metal catalyst, omega-hydroxy propargylic acetates choose between alternative cycloetherification manifolds to produce functionalized heterocycles in high yields. AuCl catalyzes the formation of oxacyclic enol acetates, whereas [Cl(2)Pt(CH(2)CH(2))]2 (Zeise's dimer) will induce a propargylic substitution via an unprecedented S(N)2'-type allenic substitution from within
An economic and practical transformation from secondary alkyl-substituted propargyl acetates to a variety of nucleophilic substitution products was described. This reaction was catalyzed by inexpensive InCl3. High yields and excellent chemoselectivity were obtained. The five-, six-, and seven-membered propargyl cycloethers were also successfully constructed by this protocol.