Directed Cobalt-Catalyzed C–H Activation to Form C–C and C–O Bonds in One Pot via Three-Component Coupling
作者:Meng-Hui Li、Xiao-Ju Si、He Zhang、Dandan Yang、Jun-Long Niu、Mao-Ping Song
DOI:10.1021/acs.orglett.0c04122
日期:2021.2.5
Herein, we disclose an efficient cobalt-catalyzed three-component coupling of benzamides, diazo compounds, and tert-butyl hydroperoxide, which provides an efficient approach to construct C(sp2)–C(sp3) and C–O bonds in one-pot accompanied with C–H activation. This protocol features low catalyst loading (4 mol %), the avoidance of additives, and excellent functional group compatibility, providing three-component
Enantioselective trapping of oxonium ylide intermediates by N -benzhydryl- α -imino ester: Synthesis of β -tetrasubstituted α -amino acids
作者:Shi-Kun Jia、Yu-Bing Lei、Long-Long Song、Shun-Ying Liu、Wen-Hao Hu
DOI:10.1016/j.cclet.2016.06.053
日期:2017.2
Abstract A synergistic rhodium(II)/phosphoric acid catalyzed three component reaction of 3-diazooxindoles, alcohols and N-benzhydryl-α-imino ester is developed for the efficient construction of chiral β-alkoxy Cβ-tetrasubstituted α-aminoacid derivatives in good yields and with excellent diastereoselectivities and high enantioselectivities. The synthetic application of the resulting products was illustrated
Synthesis and biological evaluation of 3-amino-3-hydroxymethyloxindoles as potential anti-cancer agents
作者:Kaili Jia、Xinxin Lv、Dong Xing、Jiuwei Che、Donglan Liu、Nilesh J. Thumar、Suzhen Dong、Wenhao Hu
DOI:10.1039/c6ra27536b
日期:——
(4a–4i) synthesized through a multi-component approach showed anticancer potency via in vitro cytotoxicity screening. Further, to develop the efficiency, derivatives (5a–5m) were synthesized and evaluated for their anti-proliferation activity. The most potent compound 5m showed cytotoxic effect toward SJSA-1 cells (IC50 = 3.14 μM) as well as inhibiting the growth of other cancer cell lines (HCT-116
A Rh(<scp>ii</scp>)-catalyzed three-component reaction of 3-diazooxindoles with N,N-disubstituted anilines and glyoxylates for the synthesis of 3-aryl-3-substituted oxindoles
作者:Shi-Kun Jia、Long-Long Song、Yu-Bing Lei、A. Gopi Krishna Reddy、Dong Xing、Wen-Hao Hu
DOI:10.1039/c6ob01907b
日期:——
A simple and effective method for the synthesis of 3-aryl-3-substituted oxindole derivatives via a [Rh]-catalyzed three-componentreaction of 3-diazooxindoles with N,N-disubstituted anilines and glyoxylates is developed. This transformation is proposed to proceed through an intermolecular aldol-type trapping of zwitterionic intermediates.
A highlyenantioselective [2,3] Wittig rearrangement of oxindole derivatives was realized by using a chiral N,N′‐dioxide/NiII complex as the catalyst under mild reaction conditions. A strong chiral amplification effect was observed, and allowed access to chiral 3‐hydroxy 3‐substituted oxindoles bearing allenyl groups in high yields and enantioselectivities (up to 92 % ee) by using a ligand with only
通过在温和的反应条件下使用手性N,N'-二氧化物/ Ni II络合物作为催化剂,可以实现羟吲哚衍生物的高对映选择性[2,3] Wittig重排。观察到很强的手性扩增效果,并且通过使用仅含15%ee的配体,可以高收率和对映选择性(高达92%ee)接近带有烯丙基的手性3-羟基3-取代的羟吲哚。根据实验研究和对映体纯和外消旋催化剂的X射线晶体结构,给出了合理的解释。此外,通过[2,3] Wittig重排实现了外消旋羟吲哚衍生物的第一催化动力学拆分,具有很高的效率和立体选择性。