Complementary to the Claisen rearrangement, the title reaction-which when carried out with chelated enolates of amino acid esters as nucleophiles gives rise to unsaturated amino acids-preferentially provides anti instead of syn products. This palladium-catalyzed reaction proceeds under very mild conditions and is suitable for the synthesis of enantiomerically pure amino acids (see reaction scheme)
作为克莱森重排的补充,标题反应-当与
氨基酸酯的螯合的烯醇化物作为亲核试剂进行反应时,会产生不饱和
氨基酸-优选提供反而不是顺式产物。
钯催化的反应在非常温和的条件下进行,适合于对映体纯
氨基酸的合成(请参阅反应方案)。Tfa =三
氟乙酰基。