Backbone effects in the synthesis, coordination chemistry and catalytic properties of new chiral heterobidentate ligands with P,N and S,N donor sets
作者:Máté M. Major、Zsófia Császár、Attila C. Bényei、Szabolcs Balogh、József Bakos、Gergely Farkas
DOI:10.1016/j.jorganchem.2020.121332
日期:2020.8
Novel alkane-diyl based heterobidentate P,N and S,N ligands with the general formula R1R2NCH(R3)(CH2)nCH(R4)Q (R1 = Me or iPr; R2 = H or Me; R3, R4 = H or Me; n = 0, 2; Q = PPh2 or SPh) have been prepared starting from cyclic sulfate esters or naturally occurring compounds with C1 symmetry. The length of the ligands’ backbone and the reaction conditions applied strongly affected the stereochemical
具有通式R 1 R 2 NCH(R 3)(CH 2)n CH(R 4)Q(R 1 = Me或i Pr; R 2 = H或Me; R 3,R 4 = H或Me; n = 0、2; Q = PPh 2或SPh)是从环状硫酸酯或带有C 1的天然化合物开始制备的对称。当使用环状硫酸盐作为起始原料时,配体主链的长度和所应用的反应条件强烈影响合成的立体化学结果。新配体的钯(II)配合物通过溶液中的1D和2D NMR光谱表征,在某些情况下通过固相中的X射线晶体学表征。配体的结构多功能性使得可以直接比较其配位长度,主链取代模式,供体组和主链中相对碳原子构型的关系,对其配体的立体选择性进行比较。在不对称的烯丙基烷基化反应中研究了新化合物的催化特征,其中链长被证明是决定对映选择性的关键因素。