Palladium-Catalyzed Cyclization of <i>o</i>-Alkynyltrifluoroacetanilides with Allyl Esters. A Regioselective Synthesis of 3-Allylindoles
作者:Sandro Cacchi、Giancarlo Fabrizi、Paola Pace
DOI:10.1021/jo971237p
日期:1998.2.1
The reaction of readily available o-alkynyltrifluoroacetanilides 1 with allyl esters provides a valuable new route to 3-allylindoles 3. Three basic procedures have been developed: a stepwise method based on the isolation of the N-allyl derivative 4 and its subsequent cyclization to 3 (procedure a), a one-pot reaction omitting the isolation of 4 (procedure b), and a procedure which most probably leads to the formation of 3 through a mechanism not involving the intermediacy of 4 (procedure c). In the presence of the electron-rich sterically encumbered ligand tris(2,4,6-trimethoxyphenyl)phosphine (ttmpp) the reaction exhibits remarkable regioselectivity and almost exclusive formation of 3-allylindoles with the indolyl moiety bound to the less substituted allyl terminus is usually observed. However, some loss of olefin geometry is observed.