Facile Synthesis of Coumarin- and Quinolone-Annulated Benzazoninone Derivatives by an Intramolecular Heck Reaction Strategy via 9-exo-trig Cyclization
作者:K. Majumdar、Tapas Ghosh、Srikanta Samanta
DOI:10.1055/s-0030-1260005
日期:2011.5
application of the aromatic aza-Claisen rearrangement followed by an intramolecularHeck reaction sequence as the key step has been developed for the regiocontrolled synthesis of hitherto unreported coumarin- and quinolone-annulated benzazoninone derivatives in 48-69% yield. coumarin - quinolone - benzazoninones - aza-Claisen rearrangement - Heck reaction
Aerobic intramolecular aminothiocyanation of unactivatedalkenes has been developed by in situ generated iodine thiocyanate under open-flask conditions. This protocol provides a concise and efficient method for synthesizing SCN-containing pyrrolidine, piperidine and indoline derivatives with isolated yields of up to 87%. Furthermore, mixing iodine and sodium thiocyanate with oxygen afforded iodine
Palladium-catalyzed regioselective oxidative amination of alkenes: an efficient route to the synthesis of pyrrolocoumarin and pyrroloquinolone derivatives
Palladium-catalyzed IBX-induced intramolecular oxidative amination of alkenes has been utilized for the synthesis of pyrrolocoumarin and pyrroloquinolone derivatives in excellent yields in a short reaction time.