Synthesis, Structure, and Antimalarial Activity of Some Enantiomerically Pure,<i>cis</i>-fused cyclopenteno-1,2,4-trioxanes
作者:Charles W. Jefford、Shigeo Kohmoto、Danielle Jaggi、Géza Timári、Jean-Claude Rossier、Manyck Rudaz、Olivier Barbuzzi、David Gérard、Ulrich Burger、Philippe Kamalaprija、Jiri Mareda、Gérald Bernardinelli、Ignacio Manzanares、Craig J. Canfield、Suzanne L. Feck、Brain L. Robinson、Wallace Peters
DOI:10.1002/hlca.19950780312
日期:1995.5.10
corresponding alcohols, and conversion to the (1S)-camphanates (Scheme 4), the structures of which are determined by X-ray analysis. The dynamic properties of ent-7 are investigated by NMR spectroscopy and PM3 calculations. Evidence for an easily accessible twist-boat conformation is obtained. The in vitro and in vivo antimalarialactivities of 7, ent-7,8, and ent-8 as well as those of the racemic mixtures are
Palladium/Zinc Co‐Catalyzed Asymmetric Hydrogenation of γ‐Keto Carboxylic Acids
作者:Keyang Zhang、Xuexin Zhang、Jingchao Chen、Zixiu Liu、Chunxiang Pan、Yuanbin Zhu、Shiyuan Wu、Baomin Fan
DOI:10.1002/asia.202100244
日期:2021.5.17
A palladium‐catalyzed asymmetric hydrogenation of levulinic acid has been successful developed by using Zn(OTf)2 as co‐catalyst. The present method not only has provided a strategy in the palladium‐catalyzed asymmetric hydrogenation of ketone, but also allowed the preparation of a wide range of chiral γ‐valerolactones in good yields with excellent enantioselectivities.
Cu-based carbene involved in a radical process: a new crossover reaction to construct γ-peroxy esters and 1,4-dicarbonyl compounds
作者:Jiewen Jiang、Jiajun Liu、Ling Yang、Ying Shao、Jiang Cheng、Xiaoguang Bao、Xiaobing Wan
DOI:10.1039/c5cc05183e
日期:——
Herein, a novel crossover reaction of Cu-based carbene, olefin, and tert-butyl hydroperoxide (TBHP) was well developed, leading to γ-peroxy esters and 1,4-dicarbonyl compounds.
Synthesis of Unsymmetrical 1,4-Dicarbonyl Compounds by Photocatalytic Oxidative Radical Additions
作者:Ya Dong、Ruining Li、Junliang Zhou、Zhankui Sun
DOI:10.1021/acs.orglett.1c02208
日期:2021.8.20
Herein we report a photocatalytic oxidative radical addition reaction for the synthesis of unsymmetrical 1,4-dicarbonyl compounds. This reaction utilizes a desulfurization process to generate electrophilic radicals, which add to α-halogenated alkenes and undergo further oxidation to deliver 1,4-dicarbonyl compounds. This mild and highly efficient method provides a valuable alternative to known strategies
Abstract A highly efficient intermolecular mutual addition of aromaticaldehydes with ethyl acrylate was developed by using tris(4-methoxylphenyl)phosphine as the catalyst. The reaction corresponds to the construction of 1,4-dicarbonyl compound and allylic alcohol fragments, which also provides a new way to form C-C bond. GRAPHICAL ABSTRACT