In this diploma Thesis, a method for the preparation of polycarbocyclic compounds containing all-carbon quaternary centers embedded in triquinane skeleton was prepared. The key reaction sequence leading towards the preparation of these carbocycles was Pd-catalyzed tandem cyclization/Suzuki cross-coupling reaction followed by halocarbocyclization. In the first part of synthetic project, a model oxygen-containing polycyclic derivative was prepared. In the second part, 3 novel polycarbocyclic compounds containing all-carbon quaternary centers were successfully prepared. Synthetic procedure for the starting material required for the key reaction sequence was developed. This approach represents another pathway for the synthesis of polycarbocyclic natural products. Keywords: synthesis, polycyclic compounds, quaternary centers, catalysis