A Recyclable Palladium-Catalyzed Synthesis of 2-Methylene-2,3-Dihydrobenzofuran-3-ols by Cycloisomerization of 2-(1-Hydroxyprop-2-ynyl)phenols in Ionic Liquids
A Novel Synthesis of 2-Functionalized Benzofurans by Palladium-Catalyzed Cycloisomerization of 2-(1-Hydroxyprop-2-ynyl)phenols Followed by Acid-Catalyzed Allylic Isomerization or Allylic Nucleophilic Substitution
furans 3 and 2-alkoxymethylbenzofurans 4-6, based on palladium-catalyzed cycloisomerization of 2-(1-hydroxyprop-2-ynyl)phenols 1 under basic conditions to give 2-methylene-2,3-dihydrobenzofuran-3-ols 2, followed by acid-catalyzed isomerization or allylic nucleophilic substitution with alcohols as nucleophiles, is reported. Cycloisomerization reactions leading to 2 (80-98% yields) were carried out at
[EN] BENZOFURAN CARBOXAMIDES AND THEIR THERAPEUTIC USE<br/>[FR] CARBOXAMIDES DE BENZOFURANE ET LEUR UTILISATION THERAPEUTIQUE
申请人:DARWIN DISCOVERY LTD
公开号:WO2001058895A1
公开(公告)日:2001-08-16
A compound of the formula (i) wherein R1 is C1-3 alkyl optionally substituted with one or more fluorines; R2 is CH2OCH3 or 2 or 3-tetrahydrofuranyl; R3 is a pyrazole, imidazole or isoxazole group of partial formula (A), (B) or (C); R4 is C1-3 alkyl; and R5 and R6, which may be the same or different, each represents C1-3 alkyl, halogen, CF3 or CN; or a pharmaceutically-acceptable salt thereof.