Dehydrogenative amide synthesis from alcohol and amine catalyzed by hydrotalcite-supported gold nanoparticles
作者:Jiangling Zhu、Yan Zhang、Feng Shi、Youquan Deng
DOI:10.1016/j.tetlet.2012.04.048
日期:2012.6
Hydrotalcite-supported nano-gold (Au/HT) was found to be a highly efficient heterogeneous catalyst for the dehydrogenative synthesis of amidefromalcohol and amine. Amines and alcohols with different structures could be converted into the amides under mild reaction conditions with up to 98% isolated yields. Mechanism exploration suggested that ester might be the reaction intermediate.
Ortho lithiation-in situ borylation of substituted morpholine benzamides
作者:Anna Cederbalk、Morten Lysén、Jan Kehler、Jesper L. Kristensen
DOI:10.1016/j.tet.2017.02.002
日期:2017.3
Morpholine amides are cheap and safe alternative to Weinreb amides as acylating agents of organometallic species. Herein, the in-situ lithiation/borylation of 18 ortho- meta- and para-substituted morpholine benzamides has been investigated. 10 of the 18 substrates provided the desired boronic esters as the major isomer (>90% regioselectivity) in crude isolated yields ranging from 68 to 93%. The synthetic
immobilised on a supported ionic liquid phase (SILP) with adsorbed 1-butyl-4-methylpyridinium chloride, was investigated in aminocarbonylation reactions. Double carbonylation was found to be the main reaction using different iodoarenes and aliphatic amines as substrates. Application of anilinederivatives as nucleophiles led to the exclusive formation of substituted benzamides. The stabilisation effect
Mono- and double carbonylation of aryl iodides with amine nucleophiles in the presence of recyclable palladium catalysts immobilised on a supported dicationic ionic liquid phase
Silica modified with organic dicationic moieties proved to be an excellent support for palladium catalysts used in the aminocarbonylation of aryl iodides.
analysis and deuterium-labeling experiments indicate that cleavage of ester C–O bonds by Cr and subsequent silylation leads to the formation of arylated silachromate, which regioselectively adds to carbonyls of amides through reductive elimination and deoxygenative hydrogen transfer, resulting in the reductive cross-coupling of C(aryl)–O and C(amide)═O electrophiles.