Catalytic Asymmetric Cyclopropanations with Nonstabilized Carbenes
作者:Kristen E. Berger、Raymond J. Martinez、Jianhan Zhou、Christopher Uyeda
DOI:10.1021/jacs.3c01949
日期:2023.5.3
general methods for the synthesis of chiral cyclopropanes are catalytic additions of diazoalkanes to alkenes. However, a limitation of this approach is that diazoalkanes can only be safely handled on preparative scales if they possess stabilizing substituents. Here we show that gem-dichloroalkanes can serve as precursors to nonstabilized carbenes for asymmetriccyclopropanation reactions of alkenes.
LemPhos – New P-Chiral Phospholene Core Based Ligand
作者:Adam Włodarczyk、Łukasz Ponikiewski
DOI:10.1055/a-2273-2826
日期:2024.7
Synthesis and modifications of new chiral phospholene-based scaffolds are described. The construction of base molecules was accomplished via McCormack synthesis. Separation of single P-epimers was accomplished with column chromatography on silica gel.