Wei-Ke Zhu, Jia-Wei Si, Sui-Fang Peng, Li Li, Fei Ye, Zheng Xu and Li-Wen Xu
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Ligand-controlled Rh(i)-catalyzed intramolecular alkyne sila-cyclization: divergent catalysis and mechanistic studies†
The synthesis of structurally diverse silacycles is crucial for silicon-containing drug and agrochemical development. However, catalytic synthesis of dense-functionalized silacycles based on selective cleavage and reconstruction of the carbon–silicon bond in organosilicon precursors remains largely elusive. Herein, we report divergent catalysis of ring-reconstruction transformation of silacycles based on rhodium-catalyzed Si–C bond cleavage, wherein the cyclic silylmetal intermediates undergo highly efficient and novel intramolecular Si–C bond-forming reactions under mild conditions. Under the ligand-controlled Rh-catalyzed intramolecular silacyclization process, two different pathways of new Si–C bond-forming transformations were established through intramolecular sila-cyclization reaction between alkyne moieties and silacyclobutane moieties, resulting in structurally diverse chromane-like silacycles. Furthermore, DFT calculations confirmed that bulky P-ligand P5 and the TADDOL-derived phosphonite ligand L1 played different roles in controlling the reaction pathways in the Rh-catalyzed intramolecular silacyclization and subsequent olefin migration process.
期刊介绍:
Organic Chemistry Frontiers is an esteemed journal that publishes high-quality research across the field of organic chemistry. It places a significant emphasis on studies that contribute substantially to the field by introducing new or significantly improved protocols and methodologies. The journal covers a wide array of topics which include, but are not limited to, organic synthesis, the development of synthetic methodologies, catalysis, natural products, functional organic materials, supramolecular and macromolecular chemistry, as well as physical and computational organic chemistry.