Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 61, Issue 37, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202208443
Keywords
1; 3-Diketones; Cyanosilylation; Desymmetrization; Hydrogen Bonding; Magnesium
Categories
Funding
- University of Hong Kong
- Laboratory for Synthetic Chemistry and Chemical Biology
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In this study, a bifunctional catalyst prepared from dibutylmagnesium and a pipecolinol-derived tetradentate ligand was found to enable the diastereo- and enantioselective construction of vicinal stereocenters from easily available starting materials. The high stereoselectivity was attributed to the rigid conformation of the diketone in the catalyst pocket, where the Lewis acidic magnesium center and the free hydroxyl group bind with both carbonyls.
Diastereo- and enantioselective construction of vicinal stereocenters from easily available starting materials is a challenging task. Here, we report that a bifunctional catalyst prepared from dibutylmagnesium and a pipecolinol-derived tetradentate ligand can enable an asymmetric cyanosilylation of 1,3-diketones to forge a pair of neighboring and acyclic tetrasubstituted carbons. The high stereoselectivity results from the rigid conformation of the diketone in the catalyst pocket, where the Lewis acidic magnesium center, together with the free hydroxyl group as a putative hydrogen bond donor, bind with both carbonyls. Consequently, stereochemically well-defined cyanohydrin silyl ethers with a diverse collection of substituents were prepared. Their rapid derivatization to molecules of higher complexity, such as heterocycles, triols, and fused rings, were also demonstrated.
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