Metallation in connection with cross-coupling reactions. Coupling of hindered aryls for the synthesis of 4-phenylpyridines as part of Streptonigrin and Lavendamycin analogues
The synthesis of the C-D ring system of Streptonigrin and Lavendamycin alkaloid analogues by cross-coupling under Suzuki's conditions has been studied. Steric hindrance is the main problem. It has been solved either by using strong bases or working in a sealed tube under pressure.
A new approach to the synthesis of lavendamycin analogues.
A three-steps approach to the lavendamycin skeleton from benzene, pyridine and quinoline blocks is described. It is based on a new synthetic methodology for the preparation of α-substituted β-carbolines which involves such reactions as DirectedOrtho Metalation and Heteroring Cross-Coupling.