Synthesis of Fused Polycycles by 1,4-Palladium Migration Chemistry
摘要:
Novel palladium migration/arylation methodology for the synthesis of complex fused polycycles has been developed, in which one or more sequential Pd-catalyzed intramolecular migration processes involving C-H activation are employed. The chemistry works best with electron-rich aromatics, which is in agreement with the idea that these palladium-catalyzed C-H activation reactions parallel electrophilic aromatic substitution.
Regio- and Stereoselective Synthesis of Isoindolin-1-ones via Electrophilic Cyclization
作者:Tuanli Yao、Richard C. Larock
DOI:10.1021/jo048007c
日期:2005.2.1
A variety of substituted isoindolin-l-ones are readily prepared in good to excellent yields under very mild reaction conditions by the reaction of o-(1-alkynyl)benzamides with ICI, I-2, and NBS. In a few cases, substituted isoquinolin-1-ones were obtained as the major product instead. This methodology accommodates various alkynyl amides and functional groups and has been successfully extended to heterocyclic starting materials. This chemistry has been successfully applied to the synthesis of a biologically interesting alkaloid, cepharanone B.