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。
Palladium(II)‐Catalyzed Enantioselective Azidation of Unactivated Alkenes
作者:Xiaonan Li、Xiaoxu Qi、Chuanqi Hou、Pinhong Chen、Guosheng Liu
DOI:10.1002/anie.202006757
日期:2020.9.21
of unactivated alkenes has been established by using readily accessible 1‐azido‐1,2‐benziodoxol‐3(1H)‐one (ABX) as an azidating reagent, which affords a wide variety of structurally diverse 3‐N3‐substituted piperidines in good yields with excellent enantioselectivity. The reaction features good functional‐group compatibility and mild reaction conditions. Notably, both an electrophilic azidating reagent
Ligand-Controlled Regioselective Pd-Catalyzed Diamination of Alkenes
作者:Xiaojian Liu、Chuanqi Hou、Yiyuan Peng、Pinhong Chen、Guosheng Liu
DOI:10.1021/acs.orglett.0c03634
日期:2020.12.4
A ligand-controlled system has been disclosed for the regioselective palladium-catalyzed diamination of unactivated alkenes, which provides an easy access to a variety of amino-functionalized piperidines and pyrrolidines. The steric hindrance of ligands controlled the regioselectivtities of products. 6-Endo diamination occurred with less sterically hindered quinox ligand to afford 3-aminopiperidines
Highly Selective Palladium-Catalyzed Intramolecular Chloroamination of Unactivated Alkenes by Using Hydrogen Peroxide as an Oxidant
作者:Guoyin Yin、Tao Wu、Guosheng Liu
DOI:10.1002/chem.201102776
日期:2012.1.9
Cheap and clean! A novel Pd‐catalyzed oxidative intramolecularchloroamination of unactivatedalkenes has been developed by usinghydrogenperoxide as an oxidant and CaCl2 as a chlorine source. A series of chlorinated piperidine derivatives has been obtained with high regio‐ and diastereoselectivities at room temperature (see scheme).
Highly Selective Palladium-Catalyzed Intramolecular Aminonitroxylation of Alkenes
作者:Guosheng Liu、Shujun Chen、Tao Wu、Xingliang Zhen
DOI:10.1055/s-0030-1259701
日期:2011.4
A palladium-catalyzedintramolecular oxidative aminonitroxylationof unactivated alkenes, in which AgNO 3 functioned as amild nitrate reagent in the presence of PhI(OAc) 2 , hasbeen developed. Mechanistic studies suggest that this selectiveaminonitroxylation reaction likely resulted from a new oxidant PhI(ONO 2 ) 2 generatedin situ from AgNO 3 and PhI(OAc) 2 .