T. Nagata et al., LEWIS-ACID CATALYZED DIELS-ALDER REACTION OF 3-PHENYLTHIO-2-QUINOLINONES WITH SILOXYDIENE - SYNTHESIS OF THE INTERMEDIATE FOR DYNEMICIN-A CORE, Chemical and Pharmaceutical Bulletin, 44(2), 1996, pp. 451-453
Preparation of the 1-methoxycarbonyl-3-phenylthio-2-quinolinone (10) f
rom dihydro-2-quinolinone (5) and its Diels-Alder reaction with 2-trim
ethylsilyloxy-1, 3-butadiene under Lewis acid catalyst is described. C
onversion of the D-A adduct (11) to 9-phenanthridinone ketal (16) will
open a new synthetic route to a dynemicin A core structure.