Organocatalytic asymmetric synthesis of Si-stereogenic silacycles.
basic_science · Level V
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- Record sourced from PubMed, PMID 38992000.
- Also identified by DOI 10.1038/s41467-024-49988-2 and PMC identifier 11239892.
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Abstract
A strong and confined Brønsted acid catalyzed enantioselective cyclization of bis(methallyl)silanes provides enantioenriched Si-stereogenic silacycles. High enantioselectivities of up to 96.5:3.5 er were obtained for a range of bis(methallyl)silanes. NMR and ESI-MS studies reveal that the formation of a covalent adduct irreversibly inhibits turnover. Remarkably, we found that acetic acid as an additive promotes the collapse of this adduct, enabling full turnover. Experimental investigation and density functional theory (DFT) calculations were conducted to elucidate the origin of this phenomenon and the observed enantioselectivity.