One-Pot Synthesis of α-Branched <i>N</i>-Acylamines via Titanium-Mediated Condensation of Amides, Aldehydes, and Organometallics
作者:Chunhui Dai、Julien Genovino、Bruce M. Bechle、Matthew S. Corbett、Chan Woo Huh、Colin R. Rose、Jianmin Sun、Joseph S. Warmus、David C. Blakemore
DOI:10.1021/acs.orglett.7b00082
日期:2017.3.3
A three-component, titanium-mediated synthesis of α-branched N-acylamines from commercial or readily accessible amides, aldehydes, and organometallic reagents is reported. The transformation proceeds under mild reaction conditions and tolerates a variety of functional groups (including nitrile, carbamate, olefin, basic amine, furan, and other sensitive heteroaromatics) to generate a large umbrella
CESIUM FLUORIDE-PROMOTED SYNTHESIS OF CARBOXYLIC ACID DERIVATIVES USING 2-FLUOROPYRIDINIUM SALT
作者:Shin-ichiro Shoda、Teruaki Mukaiyama
DOI:10.1246/cl.1980.391
日期:1980.4.5
In the presence of cesium fluoride, the equimolecular reactions of carboxylic acids with alcohols, amines or thiols using 2-fluoropyridinium salt proceeded smoothly under mild conditions to afford the corresponding carboxylic acid derivatives with base sensitive groups in good yields.
Various carboxylic esters or carboxamides are prepared in good yields under nearly neutral conditions from equimolar amounts of free carboxylic acids and alcohols or amines, respectively, by the use of 1,1′-dimethylstannocene as a condensing reagent.
A CONVENIENT METHOD FOR THE SYNTHESIS OF CARBOXAMIDES AND PEPTIDES BY THE USE OF TETRABUTYLAMMONIUM SALTS
作者:Yutaka Watanabe、Teruaki Mukaiyama
DOI:10.1246/cl.1981.285
日期:1981.3.5
aqueous THF with bis(o-nitrophenyl) phenylphosphonate in the presence of tetrabutylammonium hydrogen sulfate or bromide. Carboxylic esters are also successfully converted to amides via carboxylate salts in one-pot.
6-Halo-2-pyridone as an efficient organocatalyst for ester aminolysis
作者:Takeshi Yamada、Yusuke Watanabe、Sentaro Okamoto
DOI:10.1039/d1ra04651a
日期:——
catalysed esteraminolysis in which not only reactive aryl esters but also relatively less reactive methyl and benzyl esters could be used as a substrate. The reaction could be performed without strictly dry and anaerobic conditions and the 6-chloro-2-pyridone catalyst could be recovered quantitatively after reaction. The method could be applied to dipeptide synthesis from methyl or benzyl esters of amino