Synthesis of Unnatural <b>α</b>-Amino Acid Derivatives via a Three-Component Coupling Method Utilizing an Allylpalladium Umpolung
作者:Helena Malinakova、Chad Hopkins
DOI:10.1055/s-2007-990845
日期:2007.11
Highly substituted unnatural α-amino esters, for example, ethyl 3-alkyl-4-(aryl or vinyl)-2-(N-4-methoxyphenyl-amine)pent-4-enoates were prepared in a regiocontrolled and diastereoselective manner via Pd(II)-catalyzed three-component coupling of boronic acids and allenes with ethyl iminoacetate relying on the umpolung of the traditional electrophilicity of mono-π-allylpalladium complexes. The 2-aminopent-4-enoates
Allylpalladium Umpolung in the Three-Component Coupling Synthesis of Homoallylic Amines
作者:Chad D. Hopkins、Helena C. Malinakova
DOI:10.1021/ol0624528
日期:2006.12.1
[Structure: see text] Homoallylic amines and alpha-amino esters were prepared via a Pd(II)-catalyzed coupling of boronic acids and 1,2-nonadiene with ethyl iminoacetate or aliphatic, aromatic, and heteroaromatic imines. The allylpalladium umpolung was induced by a Pd(OAc)2 catalyst with commercial phosphine ligands.