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。
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
mCPBA-mediated metal-free intramolecular aminohydroxylation and dioxygenation of unfunctionalized olefins
作者:Gong-Qing Liu、Lin Li、Lili Duan、Yue-Ming Li
DOI:10.1039/c5ra09024e
日期:——
mCPBA-mediated metal-free intramolecular aminohydroxylation and dioxygenation reactions of unfunctionalizedolefins are reported. In the presence of 1.2 equiv. of m-chlorobenzoic peracid, different N-sulfonyl 4-penten-1-amine substrates could be cyclized via epoxide intermediates, producing the corresponding 2-hydroxymethylpyrrolidine products in up to 92% yields. The reaction could be carried out
The first enantioselective intramolecular aminocarbonylation of alkenes promoted by Pd(II)-spiro bis(isoxazoline) catalyst
作者:Toshio Shinohara、Midori A. Arai、Kazuhiko Wakita、Takayoshi Arai、Hiroaki Sasai
DOI:10.1016/s0040-4039(02)02650-3
日期:2003.1
acceleration effect of spiro bis(isoxazoline) ligand (SPRIX) on the Pd(II)-catalyzed intramolecular aminocarbonylation of alkenyl amine derivatives was realized. Furthermore, the chiral Pd(II)–SPRIX catalyst accomplished the first enantioselective intramolecular aminocarbonylation. The reaction of N-(2,2-dimethyl-pent-4-enyl)-p-toluenesulfonamide in the presence of Pd(II)–SPRIX catalyst and p-benzoquinone in
Intramolecular Olefin Diamination for the Stereoselective Synthesis of 3-Aminopiperidines
作者:Simon Blakey、Aidi Kong
DOI:10.1055/s-0031-1290591
日期:2012.4
direct intramolecular diamination of terminal olefins is presented. The reaction, mediated by hypervalent iodine oxidants, produces substituted 3-aminopiperidine scaffolds with high regio- and stereoselectivity, rendering this process relevant to both medicinal chemistry and natural products synthesis. A general method for the direct intramolecular diamination of terminal olefins is presented. The reaction