Palladium(II)‐Catalyzed Intermolecular Cascade Cyclization of Methylenecyclopropanes with Aromatic Alkynes: Construction of Spirocyclic Compounds Containing Indene and 1,2‐Dihydronaphthalene Moieties
作者:Wei Fang、Yin Wei、Min Shi
DOI:10.1002/adsc.201900327
日期:2019.7.11
A palladium(II)‐catalyzed intermolecular cascade cyclization of methylenecyclopropanes with aromatic alkynes is reported in this paper. The reaction involves a migratory insertion of alkyne, an intramolecular Heck‐type reaction, and β‐H elimination, providing a series of spirocyclic compounds containing indene and 1,2‐dihydronaphthalene moieties in moderate to excellent yields upon heating.
two-step method for the synthesis of 1,3-diaryl-2-methoxyindenes from1-(1-aryl-2-methoxyvinyl)-2-bromobenzenes has been developed. Thus, the reaction of 2-(1-aryl-2-methoxyvinyl)phenyllithiums, generated in situ by halogen–lithium exchange between 1-(1-aryl-2-methoxyvinyl)-2-bromobenzenes and butyllithium, with aromatic aldehydes gives aryl[2-(1-aryl-2-methoxyvinyl)phenyl]methanols, which in turn are treated