CATALYST FOR CONVERTING ESTER TO AMIDE USING HYDROXYL GROUP AS ORIENTATION GROUP
申请人:CHUBU UNIVERSITY EDUCATIONAL FOUNDATION
公开号:US20210070690A1
公开(公告)日:2021-03-11
Provided is a method for amidating a hydroxy ester compound at a high chemical selectivity. The amidation reaction method for a hydroxy ester compound comprises, in the presence of a catalyst containing a compound of a transition metal of the group 4 or group 5 in the periodic table, reacting at least one kind of hydroxy ester compound selected from the group consisting of an α-hydroxy ester compound, a β-hydroxy ester compound, a γ-hydroxy ester compound and a δ-hydroxy ester compound with an amino compound so as to amidate an ester group having a hydroxyl group at the α-, β-, γ- or δ-position of the hydroxy ester compound.
Versatile One-Step One-Pot Direct Aldol Condensation Promoted by MgI2
作者:Han-Xun Wei、Kunyu Li、Qian Zhang、Richard L. Jasoni、Jiali Hu、Paul W. Paré
DOI:10.1002/hlca.200490211
日期:2004.9
A true one-stepone-pot aldol-reaction procedure has been developed for the synthesis of β-hydroxy ketones and esters. The reaction can be run at room temperature by simply mixing four components in CH2Cl2, with medium-to-high yields of aldol products obtained after regular workup. Mechanistically, the process probably proceeds via Mg-enolate formation of the ketone or ester component, followed by
Decarboxylative Ketone Aldol Reactions: Development and Mechanistic Evaluation under Metal-Free Conditions
作者:Nicole Blaquiere、Daniel G. Shore、Sophie Rousseaux、Keith Fagnou
DOI:10.1021/jo901022j
日期:2009.8.21
acid half oxyesters (MAHOs) are shown to undergo decarboxylative nucleophilic addition reactions with ketone and aldehyde electrophiles in the presence of stoichiometric or catalytic quantities of triethylamine at room temperature. The ability to perform these reactions undermetal-freeconditions has enabled a detailed mechanistic analysis of the reaction pathway leading to the 1H NMR spectroscopic
在室温下,在化学计量或催化量的三乙胺存在下,丙二酸半硫酯(MAHT)和丙二酸半氧基酯(MAHO)与酮和醛亲电子发生脱羧亲核加成反应。在无金属条件下进行这些反应的能力使得能够对导致1的反应路径进行详细的机理分析。亲核后加成/脱羧前中间体的1 H NMR光谱表征和该中间体可逆形成后不可逆脱羧的实验证据。还确定了反应路径中每个键形成/键断裂步骤的速率常数,从而阐明了在这些过程中MAHO和MAHT亲核试剂之间不同的反应性。最后,通过这些研究获得的机理见解已被用于开发新的脱羧香豆素合成方法。
PROCESSES FOR THE PREPARATION OF 5-HYDROXY-3-OXOPENTANOIC ACID DERIVATIVES
申请人:KANEKA CORPORATION
公开号:EP1104750A1
公开(公告)日:2001-06-06
Processes by which 5-hydroxy-3-oxopentanoic acid derivatives useful as intermediates of drugs can be prepared from inexpensive and easily available raw materials under noncryogenic conditions. Specifically, a process for preparing 5-hydroxy-3-oxopentanoic acid derivatives by making lithium amide act on a mixture of an acetic acid ester and a 3-hydroxypropionic acid derivative at a temperature of -20 °C or above; and another process for preparing 5-hydroxy-3-oxopentanoic acid derivatives by treating a mixture of an acetic acid ester and a 3-hydroxypropionic acid derivative with a Grignard reagent and then making lithium amide act on the resulting mixture at a temperature of -20 °C or above.