[GRAPHICS]Enantiopure epoxy vinyl sulfones serve as highly effective substrates for a variety of stereo- and regiospecific oxidation and nucleophilic functionalization reactions. These materials can be easily transformed to cyclic and acyclic six carbon segments. Nucleophilic epoxidation of 3a,b followed by palladium[0] catalysis enables access to differentially protected arene diols 21 and 22.
[GRAPHICS]Enantiopure epoxy vinyl sulfones serve as highly effective substrates for a variety of stereo- and regiospecific oxidation and nucleophilic functionalization reactions. These materials can be easily transformed to cyclic and acyclic six carbon segments. Nucleophilic epoxidation of 3a,b followed by palladium[0] catalysis enables access to differentially protected arene diols 21 and 22.
Versatile and Functionalised Intermediates for the Synthesis of Vitamin D and Novel Vitamin D Derivatives
申请人:ENDOTHERM GMBH
公开号:US20150344421A1
公开(公告)日:2015-12-03
Novel intermediates for the complete synthesis of vitamin D are provided that allow a great versatility of functional groups in the final vitamin derivatives. Vitamin derivatives that are epimeric in position 3 and vitamin derivatives with a wide range of functionalities in position 18, including compounds with isotopic labelling are provided.
VERSATILE AND FUNCTIONALISED INTERMEDIATES FOR THE SYNTHESIS OF VITAMIN D AND NOVEL VITAMIN D DERIVATIVES
申请人:Endotherm GmbH
公开号:EP2933246B1
公开(公告)日:2020-01-08
Intramolecular Methylation of an Allyl Sulfone via Lithium Alkoxyaluminate; Application to the Enantioselective Synthesis of the CD Ring of Vitamin D<sub>3</sub>
作者:Vikas Sikervar、Philip L. Fuchs
DOI:10.1021/ol301144a
日期:2012.6.1
Alcohol-directed intramolecular methylation of an enantiopure allyl sulfone using AIMe(3) provides a trans-hydrindane CD ring alcohol. The substrate cis-CD ring allyl sulfone alcohol is prepared via intramolecular allyl sulfonyl anion addition to aldehyde using Ba(OH)(2).