Regioselective Prenylation of Phenols by Palladium Catalyst: Syntheses of Prenylphenols and Chromans
摘要:
The palladium-catalyzed coupling reaction of iodophenols (1) with 2-methyl-3-butyn-2-ol gave alkynylphenols (2). Catalytic hydrogenation of 2 over Raney nickel and the subsequent dehydration of the resultant alkylphenols (3) gave regioselectively the desired prenylphenols (4). Dehydration of alkylphenols (3f-h) gave chromans (7).
Regioselective Prenylation of Phenols by Palladium Catalyst: Syntheses of Prenylphenols and Chromans
摘要:
The palladium-catalyzed coupling reaction of iodophenols (1) with 2-methyl-3-butyn-2-ol gave alkynylphenols (2). Catalytic hydrogenation of 2 over Raney nickel and the subsequent dehydration of the resultant alkylphenols (3) gave regioselectively the desired prenylphenols (4). Dehydration of alkylphenols (3f-h) gave chromans (7).
P-hydroxyacetophenone derivatives from senecio graveolens
作者:Luis A. Loyola、Samuel Pedreros、Glauco Morales
DOI:10.1016/s0031-9422(00)81074-2
日期:1985.1
Abstract 5-Acetylsalicylaldehyde and 4-hydroxy-3(3'-hydroxyisopentyl) acetophenone were isolated fromSenecio graveolens in addition to the already known compounds dihydroeuparin, 4-hydroxy-3-(isopenten-2-yl)acetophenone and 3-hydroxy-2,2-dimethyl-6-acetylchromane.