Lewis Acid Catalyzed Diels-Alder Reaction of 3-Phenylthio-2-quinolinones with Siloxydiene. Synthesis of the Intermediate for Dynemicin A Core.

Abstract

Preparation of the 1-methoxycarbonyl-3-phenylthio-2-quinolinone (10) from dihydro-2-quinolinone (5) and its Diels-Alder reaction with 2-trimethylsilyloxy-1, 3-butadiene under Lewis acid catalyst is described. Conversion of the D-A adduct (11) to 9-phenenthridinone ketal (16) will open a new synthetic route to a dynemicin A core structure.