The direct preparation of free-base porphyrins possessing reactive functional groups such as esters, halides, amide, nitriles, and acetals is described. This method relies on a simple one-pot procedure that involves sequential palladium-catalyzed cross-coupling of brominated free-base porphyrins with functionalized aryl and alkenylmagnesium reagents, which are readily prepared by iodine magnesium exchange of the corresponding organic iodides with the turbo Grignard reagent i-PrMgCl center dot LiCl, followed by demetallation of the resulting magnesium porphyrins under very mild conditions involving either a 1.2 M aqueous methanol solution of HCl or a 0.1 M methanol solution of citric acid at ambient temperature.
[EN] COPPER-CATALYZED FORMATION OF CARBON-HETEROATOM AND CARBON-CARBON BONDS<br/>[FR] FORMATION DE LIAISONS CARBONE-HETEROATOME ET CARBONE-CARBONE CATALYSEE PAR DU CUIVRE
申请人:MASSACHUSETTS INST TECHNOLOGY
公开号:WO2004013094A3
公开(公告)日:2004-08-26
Synthesis of 1-trimethylsilyl 1,3-dienes by the palladium-catalyzed reaction of trimethylvinylsilane with vinyl iodides/silver nitrate or vinyl triflates