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
通过 Pd 以区域控制和非对映选择性的方式制备高度取代的非天然 α-氨基酯,例如 3-烷基-4-(芳基或乙烯基)-2-(N-4-甲氧基苯基-胺)戊酸乙酯(II)-催化硼酸和丙二烯与亚氨基乙酸乙酯的三组分偶联,依赖于单-π-烯丙基钯配合物的传统亲电性的umpolung。对 2-氨基戊-4-烯酸酯进行 N-烯丙基化和分子内闭环复分解,得到具有 α-氨基酯基团的四氢吡啶。