Turning the Nitrogen Atoms of an Ar<sub>2</sub>
P−CH<sub>2</sub>
−N−N−CH<sub>2</sub>
−PAr<sub>2</sub>
Motif into Uniquely Configured Stereocenters: A Novel Diphosphane Design for Asymmetric Catalysis
作者:Eva Diehl née Knobloch、Reinhard Brückner
DOI:10.1002/chem.201706160
日期:2018.3.7
Hexahydropyridazines with CH2PAr2 groups at both N atoms are newly designed 1,4‐diphosphanes and were synthesized for the first time. Their N atoms assume a single configuration under the influence of stereocenters at C‐5 and C‐6. In the solid state, these N‐atoms bind the CH2PAr2 substituents axially. Combined with Pd0, N,N′‐chiral diphosphanes of this kind catalyzed Tsuji–Trost type allylations of dialkyl malonates
在两个N原子上均具有CH 2 PAr 2基团的六氢哒嗪是新设计的1,4-二膦烷,是首次合成。它们的N原子在C-5和C-6的立体中心的影响下呈单一构型。在固态下,这些N原子轴向结合CH 2 PAr 2取代基。与此类的Pd 0,N,N'-手性二膦烷结合,可有效地与乙酸外消旋1,3-二苯基烯丙基乙酸酯催化二甲基丙二酸酯的Tsuji-Trost型烯丙基化,且ee高达91% 。