Synthesis of nitrones by methyltrioxorhenium catalyzed direct oxidation of secondary amines
作者:Andrea Goti、Luca Nannelli
DOI:10.1016/0040-4039(96)01266-x
日期:1996.8
Oxidation of secondaryamines catalyzed by methyltrioxorhenium (MTO) with H2O2 or urea-hydrogen peroxide complex (UHP) at room temperature gives the corresponding nitrones in good yields.
在室温下,用H 2 O 2或脲-过氧化氢络合物(UHP)将甲基三氧ox(MTO)催化的仲胺氧化,可以得到相应的硝酮,收率很高。
Mannich‐type Reactions of Cyclic Nitrones: Effective Methods for the Enantioselective Synthesis of Piperidine‐containing Alkaloids
作者:Vladislav G. Lisnyak、Tessa Lynch‐Colameta、Scott A. Snyder
DOI:10.1002/anie.201809799
日期:2018.11.12
dozens of biologically active 2-substituted and 2,6-disubstituted piperidines, only a limited number of approaches exist for their synthesis. Herein is described two Mannich-type additions to nitrones, one using β-ketoacids under catalyst-free conditions and another using methyl ketones in the presence of chiral thioureas, which can generate a broad array of such 2-substituted materials, as well as other
An Enantioselective Total Synthesis and Stereochemical Revision of (+)-Citrinadin B
作者:Ke Kong、John A. Enquist、Monica E. McCallum、Genessa M. Smith、Takanori Matsumaru、Elnaz Menhaji-Klotz、John L. Wood
DOI:10.1021/ja405548b
日期:2013.7.31
This manuscript describes an enantioselectivesynthesis of the naturally occurring alkaloid citrinadin B. The synthetic effort revealed an anomaly in the original structural assignment that has led to the proposal of a stereochemicalrevision. This revision is consistent with the structures previously reported for a closely related family of alkaloids, PF1270A-C. The synthesis is convergent and employs
这份手稿描述了天然存在的生物碱 citrinadin B 的对映选择性合成。 合成工作揭示了原始结构分配中的异常,这导致了立体化学修订的提议。此修订版与先前报告的密切相关的生物碱家族 PF1270A-C 的结构一致。该合成是收敛的,并采用立体选择性分子间硝酮环化反应作为关键步骤。
Synthesis of trans-2,6-dialkylpiperidines by 1,3-cycloaddition of alkenes to 2-alkyl-2,3,4,5-tetrahydropyridine oxides
作者:William Carruthers、Michael J. Williams
DOI:10.1039/c39860001287
日期:——
A convenient route to trans-2,6-dialkylpiperidines by cycloaddition of alkenes to 2-alkyl-2,3,4,5-tetrahydropyridineoxides followed by reductive cleavage of the resulting isoxazolidine is illustrated by a synthesis of the fire ant-venom alkaloid, solenopsin.
Highly efficient and mild synthesis of nitrones by catalytic oxidation of hydroxylamines with tetra-n-propylammonium perruthenate
作者:Andrea Goti、Francesco De Sarlo、Michela Romani
DOI:10.1016/s0040-4039(00)78275-x
日期:1994.8
Oxidation of N,N-disubstituted hydroxylamines by N-methylmorpholine N-oxide (NMO) and catalytic amounts of tetra-n-propylammonium perruthenate (TPAP) at room temperature occurs very rapidly to give the corresponding nitrones, which can be trapped by dipolarophiles present in the reaction mixture, in excellent yields. A competitive experiment in the presence of a primary alcohol gave a > 50:1 nitrone