Highly Substituted Lactone/Ester-Containing Furan Library by the Palladium-Catalyzed Carbonylation of Hydroxyl-Substituted 3-Iodofurans
摘要:
Highly substituted lactone- and ester-containing furans have been prepared by the efficient palladium-catalyzed intramolecular cyclocarbonylation or intermolecular carboalkoxylation, respectively, of hydroxyl-containing 3-iodofurans, readily prepared by the iodocyclization of 2(1-alkynyl)-2-alken-1-ones in the presence of various diols.
H‐Bonded Counterion‐Directed Catalysis: Enantioselective Gold(I)‐Catalyzed Addition to 2‐Alkynyl Enones as a Case Study
作者:Àlex Martí、Marc Montesinos‐Magraner、Antonio M. Echavarren、Allegra Franchino
DOI:10.1002/ejoc.202200518
日期:2022.10.13
H-bonded counterion-directed catalysis has been applied to the enantioselective tandem cycloisomerization-addition to 2-alkynyl enones. The addition of C-, N- or O-centered nucleophiles catalyzed by a phosphinosquaramide Au(I) chloride/chiral Ag(I) phosphoramidate system afforded bicyclic furans in moderate to excellent yield and enantioselectivity (28 examples, 59–96 % yield, 62 : 38 to 95 : 5 er)
Solution-Phase Synthesis of a Highly Substituted Furan Library
作者:Chul-Hee Cho、Feng Shi、Dai-Il Jung、Benjamin Neuenswander、Gerald H. Lushington、Richard C. Larock
DOI:10.1021/co300040q
日期:2012.7.9
A library of furans has been synthesized by iodocyclization and further diversified by palladium-catalyzed coupling processes. The key intermediate 3-iodofurans have been prepared by the electrophilic iodocyclization of 2-iodo-2-alken-1-ones in the presence of various nucleophiles in good to excellent yields under mild reaction conditions. These 3-iodofurans are the key components for library generation through subsequent elaboration by palladium-catalyzed processes, such as Suzuki-Miyaura, Sonagashira, Heck, aminocarbonylation, and carboalkoxylation chemistry to afford a diverse set of 2,3,4,5-tetrasubstituted furans.