Synthesis of N , N -bis[2-(2-pyridyl)ethyl]amino steroids and related compounds intended as chiral ligands for copper ions
作者:Manuela Gonschior、Manuela Kötteritzsch、Matthias Rost、Bruno Schönecker、Ralf Wyrwa
DOI:10.1016/s0957-4166(00)00168-3
日期:2000.6
N-bis[2-(2-pyridyl)ethyl]amino structure (RPY2) are useful tridentate ligands for copper(I) ions, which can bind and activate oxygen from the atmosphere. For diastereoselective and enantioselective oxidation reactions, hitherto unknown chiral ligands possessing tripodal structures have been synthesized starting from homochiral steroids. The double Michael addition of primary steroidal amines and aminoalcohols
具有N,N-双[2-(2-吡啶基)乙基]氨基结构(RPY2)的化合物对于铜(I)离子是有用的三齿配体,它可以结合并激活大气中的氧气。对于非对映选择性和对映选择性氧化反应,迄今未知的具有三脚架结构的手性配体是从同手性类固醇开始合成的。伯类固醇胺和氨基醇向2-乙烯基吡啶的双迈克尔加成反应不是很成功。然而,在大多数情况下,可以通过该方法获得具有N- [2-(2-吡啶基)乙基]氨基甾类结构的同手性双齿配体。新路线(用2-吡啶基乙酸接着BH 3酰化二齿配体)·描述了在空间位阻位置也将THF还原或类固醇酮的还原胺化,酰化和硼烷还原)成所需的三齿RPY2。在最后的反应顺序中,也可以得到“混合的”三齿配体。简要讨论了铜与这些配体的络合和氧活化作用。