Convergent synthesis of the streptonigrin alkaloid skeleton. Directed orthometalation connection to aryl-aryl cross-coupling
摘要:
A convergent synthesis of 2-[2-(4-phenyl-3-pivaloylamino) pyridyl]quinolines, the streptonigrin alkaloid skeleton, is reported. The methodology involves independent elaboration of the three main building blocks by metalation and two coupling reactions catalyzed by palladium.
Metallation in connection with cross-coupling reactions. Coupling of hindered aryls for the synthesis of 4-phenylpyridines as part of Streptonigrin and Lavendamycin analogues
摘要:
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.