Studies on the syntheses of heterocyclic compounds and natural products. 999. Double enamine annelation of 3,4-dihydro-1-methyl-.beta.-carboline and isoquinoline derivatives with 6-methyl-2-pyrone-3,5-dicarboxylates and its application for the synthesis of (.+-.)-camptothecin
Studies on the syntheses of heterocyclic compounds and natural products. 999. Double enamine annelation of 3,4-dihydro-1-methyl-.beta.-carboline and isoquinoline derivatives with 6-methyl-2-pyrone-3,5-dicarboxylates and its application for the synthesis of (.+-.)-camptothecin