Two pentacyclic analogues of the retinoid temarotene (1) have been prepared. We describe the first palladium-catalyzed coupling of a stannylated pyridine with an aromatic triflate and a novel way for the preparation of the benzo-[c]-1,8-naphthyridine skeleton.
Two pentacyclic analogues of the retinoid temarotene (1) have been prepared. We describe the first palladium-catalyzed coupling of a stannylated pyridine with an aromatic triflate and a novel way for the preparation of the benzo-[c]-1,8-naphthyridine skeleton.