Synthesis of esters from aldehydes or carboxylic acids with dichloromethane, dichloroethane or dichloropropane under mild conditions
作者:Feng Lin、Qiang Feng、Xiuling Cui、Qiuling Song
DOI:10.1039/c3ra43615b
日期:——
Dichloromethane (DCM) as a C1 source has been discovered: methylene diesters from DCM and carboxylic acids or aldehydes with TBHP in water were efficiently synthesized. The reactions proceed under mild conditions and afford both aliphatic and aromatic methylene diesters in good to excellent yields (up to >99%). 2-Chloroethyl benzoates and 3-chloropropyl benzoates are easily obtained in the same way from 1,2-dichloroethane and 1,3-dichloropropane, respectively, in good to excellent yields.
Solvent-free synthesis of symmetric methylene diesters <i>via</i> direct reaction of aromatic carboxylates with 1,<i>n</i>-dihaloalkanes
作者:Lin Bai、Shenglong Ding、Xiaofang Ma
DOI:10.1039/d1ra04814g
日期:——
An efficient methodology for the synthesis of symmetrical methylene diesters was developed through direct reaction of various aromatic carboxylates with 1,n-dihaloalkanes under solvent-free conditions. This strategy offers a high product yield, facile work-up and purification, and an environmentally friendly approach to obtain long-chain methylene carboxylate scaffolds with increased diversity.
DBU-CH<sub>3</sub>I, a Potential Substitute for CH<sub>2</sub>N<sub>2</sub> in the Preparation of Methyl Esters and Methyl Aryl Ethers: Studies with Assorted Acids
作者:Dipakranjan Mal、Amit Jana、Sutapa Ray、Sourav Bhattacharya、Asit Patra、Saroj R. De
DOI:10.1080/00397910802238809
日期:2008.10.28
Abstract DBU-CH3I has been poised to be a substitute for diazomethane in the preparation of methylestersfromcarboxylic acids. The reactions can be carried out in commercial untreated acetone and acetonitrile, which have been exemplified with several methylesters, otherwise it is difficult to prepare. Bis-esterification using diiodomethane can also be achieved in a similar fashion. Sufficiently
Palladium(II)-Catalyzed<i>ortho</i>Alkylation of Benzoic Acids with Alkyl Halides
作者:Yang-Hui Zhang、Bing-Feng Shi、Jin-Quan Yu
DOI:10.1002/anie.200902262
日期:2009.8.3
Outsmarting the competition: In the PdII‐catalyzed reaction of benzoates with alkyl halides, an aryl CH bond is activated before the competitive alkylation of the carboxylate anion can takes place. The alkylation reaction was followed by an intramolecular lactonization to give broadly useful γ‐ and δ‐benzolactones (see scheme).
战胜竞争:在 Pd II催化的苯甲酸盐与卤代烷的反应中,芳基 C H 键在羧酸根阴离子的竞争性烷基化发生之前被激活。烷基化反应后进行分子内内酯化,得到广泛有用的 γ- 和 δ-苯内酯(参见方案)。
Novel Monensin Derivatives for the Treatment and Prevention of Protozoal Infections
申请人:Delaveau Jean
公开号:US20120128722A1
公开(公告)日:2012-05-24
This invention relates to novel polyether ionophores, formulations comprising same, and to methods of making and using these compounds and formulations for the treatment and/or prevention of parasitic infection in animals and humans. These compounds exhibit improved safety profiles and/or efficacies as compared to parent compounds.