Palladium-Catalyzed Intramolecular Aminoacetoxylation of Unactivated Alkenes with Hydrogen Peroxide as Oxidant
作者:Haitao Zhu、Pinhong Chen、Guosheng Liu
DOI:10.1021/acs.orglett.5b00373
日期:2015.3.20
A palladium-catalyzed intramolecular aminoacetoxylation of unactivated alkenes was developed in which H2O2 was used as the sole oxidant. A variety of 3-acetoxylated piperidines were obtained in good yields with good to excellent regio- and diastereoselectivities. Mechanistic study revealed that the addition of di(2-pyridyl) ketone (dpk) ligand was crucial to promote the oxidative cleavage of the C–Pd(II)
开发了钯催化的未活化烯烃的分子内氨基乙酰氧基化反应,其中H 2 O 2被用作唯一的氧化剂。以良好的产率获得了各种3-乙酰氧基化的哌啶,具有良好或优异的区域和非对映选择性。机理研究表明,添加二(2-吡啶基)酮(dpk)配体对于促进H 2 O 2氧化C-Pd(II)键产生C-OAc键至关重要。
Copper(II)-Catalyzed Enantioselective Intramolecular Carboamination of Alkenes
作者:Wei Zeng、Sherry R. Chemler
DOI:10.1021/ja0762240
日期:2007.10.1
The reactions are catalyzed by chiral copper(II) complexes, and MnO2 is used as the inexpensive stoichiometric oxidant. A variety of five-membered heterocycles and a tetrahydroisoquinoline have been synthesized in good to excellent yields with good to excellent levels of enantioselectivity. This is the first reported copper-catalyzed enantioselective carboamination of alkenes.
介绍了用于合成氮杂环的 γ-烯基芳基磺酰胺和 δ-烯基芳基磺酰胺的对映选择性氧化环化。该反应由手性铜 (II) 配合物催化,MnO2 用作廉价的化学计量氧化剂。各种五元杂环和四氢异喹啉已以良好至极好的收率和良好至极好的对映选择性水平合成。这是首次报道的铜催化烯烃的对映选择性碳胺化。
Asymmetric Copper-Catalyzed Intermolecular Aminoarylation of Styrenes: Efficient Access to Optical 2,2-Diarylethylamines
作者:Dinghai Wang、Lianqian Wu、Fei Wang、Xiaolong Wan、Pinhong Chen、Zhenyang Lin、Guosheng Liu
DOI:10.1021/jacs.7b02455
日期:2017.5.24
After addition to styrene, the generated benzylic radical could couple with a chiral L*CuIIAr complex to achieve enantioselective arylation. Various optical 2,2-diarylethylamines were efficiently synthesized from simple styrenes with high enantioselectivity, and these products can serve as valuablesynthons toward bioactive molecules' synthesis.
Enantioselective Pd(II)-Catalyzed Intramolecular Oxidative 6-<i>endo</i> Aminoacetoxylation of Unactivated Alkenes
作者:Xiaoxu Qi、Chaohuang Chen、Chuanqi Hou、Liang Fu、Pinhong Chen、Guosheng Liu
DOI:10.1021/jacs.8b03767
日期:2018.6.20
A novel asymmetric 6-endo aminoacetoxylation of unactivatedalkenes by palladium catalysis, which yields chiral β-acetoxylated piperidines with excellent chemo-, regio- and enantioselectivities under very mild reaction conditions, has been established herein by employing a new designed pyridine-oxazoline (Pyox) ligand. Importantly, introducing a sterically bulky group into the C-6 position of Pyox
Palladium-Catalyzed Intramolecular Aminotrifluoromethoxylation of Alkenes
作者:Chaohuang Chen、Pinhong Chen、Guosheng Liu
DOI:10.1021/jacs.5b10971
日期:2015.12.23
The first catalytic trifluoromethoxylation of unactivated alkenes has been developed, in which Pd(CH3CN)(2)Cl-2 was used as catalyst, AgOCF3 as trifluoromethoxide source, and Selectfluor-BF4 as oxidant. A variety of 3-OCF3 substituted piperidines were selectively obtained in good yields. Direct evidence was provided to address the facile reductive elimination of Pe(IV)-OCF3 complex to form sp(3) C-OCF3 bond.