Lanthanoid complex as a novel carbon dioxide carrier for the carboxylation of active methylene compounds under mild conditions
作者:Hiroshi Abe、Shohei Inoue
DOI:10.1039/c39940001197
日期:——
A lanthanoid complex, formed by the addition of a lanthanoid alkoxide to an isocyanate, serves as a novel carbon dioxide carrier for the rapid carboxylation of active methylene compounds under mild conditions.
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。
Decarboxylative Amination of SMAHOs by Dialkyl Azodicarboxylates
作者:Marine Pinaud、Erwan Le Gall、Marc Presset
DOI:10.1002/ejoc.202400128
日期:2024.4.22
The organocatalyzed decarboxylative addition of substituted malonic acid half oxyesters (SMAHOs) to dialkyl azodicarboxylates led to the formation of α-aminoester derivatives. The reaction can be performed under mild reaction conditions using 1,4-diazabicyclo[2.2.2]octane (DABCO) as a catalyst and displayed a rather important scope.
Preparation of mono-substituted malonic acid half oxyesters (SMAHOs)
作者:Tania Xavier、Sylvie Condon、Christophe Pichon、Erwan Le Gall、Marc Presset
DOI:10.3762/bjoc.17.135
日期:——
The use of mono-substituted malonic acid half oxyesters (SMAHOs) has been hampered by the sporadic references describing their preparation. An evaluation of different approaches has been achieved, allowing to define the best strategies to introduce diversity on both the malonic position and the ester function. A classical alkylation step of a malonate by an alkyl halide followed by a monosaponification