Enantiodivergent Kinetic Resolution of 1,1′‐Biaryl‐2,2′‐Diols and Amino Alcohols by Dipeptide‐Phosphonium Salt Catalysis Inspired by the Atherton–Todd Reaction
作者:Siqiang Fang、Jian‐Ping Tan、Jianke Pan、Hongkui Zhang、Yuan Chen、Xiaoyu Ren、Tianli Wang
DOI:10.1002/anie.202102352
日期:2021.6.25
halide catalyst differentiates between the in-situ-generated P-species in the A-T process, mainly involving phosphorylchloride and phosphoric anhydride, thus leading to highly enantiodivergent O-phosphorylation reactions. Furthermore hydrogen bonding interactions between the catalysts and phosphorus molecules were crucial in asymmetric induction.
公开了一种高度对映发散的有机催化方法,通过受二肽-鏻盐催化的 Atherton-Todd (AT) 反应启发的动力学拆分合成阻转异构联芳基化合物。这种灵活的方法通过微调具有优异选择性因子的双功能鏻,产生R - 和S - 对映异构体(s) 分别高达 1057 和 525。轴向手性有机磷化合物的合成说明了新合成的 O-磷酸化联芳二醇的潜力。机理研究表明,双功能卤化鏻催化剂区分了 AT 过程中原位生成的 P 物种,主要涉及磷酰氯和磷酸酐,从而导致高度对映发散的 O-磷酸化反应。此外,催化剂和磷分子之间的氢键相互作用在不对称诱导中至关重要。
An enantioselective oxidative coupling reaction of 2-naphthol derivatives catalyzed by chiral diphosphine oxide–iron(<scp>ii</scp>) complexes
An enantioselective oxidative coupling of 2-naphthol derivatives is developed with the use of chiral Fe(II)–diphosphine oxide complexes. Optically active 1,1-bi-2-naphthol derivatives can be synthesized in high yields when a 2 : 1 complex of (S)-xylyl-iPrO-BIPHEP-oxide and Fe(OTf)2 is used in the presence of t-butyl hydroperoxide as an oxidant. The non-linear effect, X-ray crystal structure and ESI-MS