Cobalt-Catalyzed Asymmetric Hydrogenation of 1,1-Diarylethenes
作者:Jianhui Chen、Chenhui Chen、Chonglei Ji、Zhan Lu
DOI:10.1021/acs.orglett.6b00453
日期:2016.4.1
Highlyenantioselective cobalt-catalyzed hydrogenation of 1,1-diarylethenes was developed by using bench-stable chiral oxazoline iminopyridine–cobalt complexes as precatalysts. A unique o-chloride effect was observed to achieve high enantioselectivity. Easy removal as well as further transformations of the chloro group make this protocol a potentially useful alternative to synthesize various chiral
Chiral iridium complexes ligated by anionic oxazoline-bearing NCP-type pincer ligands were developed and applied to the asymmetric transfer hydrogenation (ATH) of diarylethenes using environmentally benign ethanol as the hydrogen donor. High enantioselectivities could be achieved for substrates bearing ortho-Me, ortho-Cl, or ortho-Br substituents on one of the aryl groups. The ATH of ortho-Br-substituted
开发了由带有阴离子恶唑啉的 NCP 型钳形配体连接的手性铱配合物,并将其应用于使用环境友好型乙醇作为氢供体的二芳基乙烯的不对称转移氢化 (ATH)。对于在芳基之一上带有邻-Me、邻-Cl或邻-Br取代基的底物可以实现高对映选择性。由于 C (芳基) -Br 键易于经历各种新的键形成事件,邻位-Br 取代的二芳基乙烯的 ATH特别有吸引力。
The synthesis of (deuterated) 1,1-disubstituted alkenes via Pd-catalyzed decarboxylative hydroarylation of alkynyl carboxylic acids with arylboronicacids has been developed. The reaction features excellent regioselectivity, a broad substrate scope and gram-scale synthetic ability and offers a general synthetic method to synthesize 1,1-dideuterio olefins. Preliminary mechanism investigations indicate
Visible Light Photoredox-Catalyzed Formyl/Carboxylation of Activated Alkenes with Glyoxylic Acid Acetals and CO2
作者:Han Yang、Yang Yao、Qi Yang、Yingming Yao、Jianwei Sun、Song Sun
DOI:10.1021/acs.orglett.4c00841
日期:2024.5.24
A photoredox-catalyzed sequential α-formyl/carboxylation of alkenes with glyoxylic acid acetals and CO2 has been developed to afford a range of masked γ-formyl esters in good yields, which could be readily transformed into diverse compounds, such as γ-formyl ester, hemiacetal, and 1,4-diol. This reaction features mild conditions, readily available starting materials, and operational simplicity.
已开发出光氧化还原催化的烯烃与乙醛酸缩醛和 CO 2的连续 α-甲酰基/羧基化反应,以良好的产率提供一系列掩蔽的 γ-甲酰酯,这些酯可以很容易地转化为各种化合物,例如 γ-甲酰基酯、半缩醛和1,4-二醇。该反应条件温和,起始原料易得,操作简单。