2-Pyridine benzimidazole/Pd(II) complex supported on SBA-15:A new heterogeneous recoverable catalyst for the Heck reaction

Palladium-catalyzed cross-coupling reactions, such as the Suzuki–Miyaura and Heck reactions, have become the standard methodologies for the synthetic organic chemists to construct useful organic compounds [1-2]. Among mesoporous silica nanoreactors, especially SBA-15, have been widely investigated due to its controllable size, composition and morphology, which are highly desirable for catalytic applications [3].In this study, 1-propargyl-2-pyridine benzimidazole was synthesized, Scheme 1, grafted into SBA-15 via a click reaction (SBA-15@PBI), and then complexed with Pd(II) ions to afford SBA-15@PBI/Pd(II), Scheme 2. The supported Pd(II) mesoporous SBA-15 catalyst showed significant efficiency in the Mizoroki-Heck cross-coupling reaction. The reaction parameters, such as solvents, the type and amount of base, catalyst dosage, temperature, and substrates ratios were optimized.

کلیدواژه ها:

mesoporous SBA-15 ، Heck cross-coupling reaction