Asymmetric radical reaction in the coordination sphere. 2. Asymmetric addition of alkane- and arenesulfonyl chlorides to olefins catalyzed by a ruthenium(II)-phosphine complex with chiral ligands
A series of optically active β-aryloxy alcohols and β-arylthiol alcohols were synthesized directly by asymmetric transfer hydrogenation of the corresponding β-carbonyl ethers or β-carbonyl sulfides in excellent yields (up to 99%) and excellent enantioselectivity (up to 100% ee) under mild reaction conditions.
The enantioselective chalcogeno-Baylis-Hillman reaction was investigated by the use of chiral hydroxy chalcogenides in the presence of TiCl4 under atmospheric pressure. The best result was obtained with 10-methylthioisobornenol as a chiral hydroxy chalcogenide.
Chemoenzymatic Cascades for the Enantioselective Synthesis of β‐Hydroxysulfides Bearing a Stereocentre at the C−O or C−S Bond by Ketoreductases
作者:Fei Zhao、Kate Lauder、Siyu Liu、James D. Finnigan、Simon B. R. Charnock、Simon J. Charnock、Daniele Castagnolo
DOI:10.1002/anie.202202363
日期:2022.8
Four ketoreductases (KREDs) were identified for the enantioselectivesynthesis of β-hydroxysulfides. KRED311 and KRED349 catalyse the synthesis of β-hydroxysulfides bearing a stereocentre at the C−Obond with opposite absolute configurations via chemoenzymaticcascades from thiophenols/thiols and α-haloketones/alcohols. KRED253 and KRED384 catalyse the synthesis of β-hydroxysulfides bearing a stereocentre
Hemilabile Diamidophosphite-Thioether Ligands with a β-Hydroxy Sulfide Backbone: Palladium(II) Complexes and Asymmetric Allylic Substitution
作者:Konstantin N. Gavrilov、Ilya V. Chuchelkin、Vladislav K. Gavrilov、Sergey V. Zheglov、Ilya D. Firsin、Valeria M. Trunina、Nataliya E. Borisova、Yan P. Bityak、Olga A. Maloshitskaya、Victor A. Tafeenko、Vladislav S. Zimarev、Nataliya S. Goulioukina
DOI:10.1021/acs.organomet.3c00212
日期:2023.8.14
Pd(II), these hemilabile ligands showed the ability to form both P,S-chelates and complexes with two ligands connected to the metal P-monodentately. The structures of the ligands and complexes were confirmed by two-dimensional (2D) NMR spectroscopy and single-crystal X-ray diffraction. These stereoselectors provided up to 98% ee in the Pd-catalyzed asymmetricallylicsubstitution of (E)-1,3-diphenylallyl
由1,2-硫醚醇合成了一系列结构多样的二酰氨基亚磷酸酯硫化物。对于 Pd(II),这些半不稳定配体表现出与单齿金属P-连接的两个配体形成P、S-螯合物和络合物的能力。配体和配合物的结构通过二维(2D)NMR 光谱和单晶 X 射线衍射证实。这些立体选择剂在 Pd 催化的 ( E )-1,3-二苯基烯丙基乙酸酯与 C-和 N-亲核试剂的不对称烯丙基取代中提供高达 98% ee,在 Pd 介导的乙酸肉桂酯的烯丙基烷基化中提供高达 78% ee与β-酮酯。此外,高达 71%ee是在 2-(二乙氧基磷酰基)-1-苯基烯丙基乙酸酯和苯胺之间的罕见反应中实现的。讨论了结构参数、反应条件和配体与金属的比例对催化结果的影响。由于配体能够形成结构不同的催化物质,因此显示出不对称诱导对配体与金属比率的显着依赖性。
General method for the synthesis of high enantiomeric purity chiral epoxides