Palladium-catalyzed regiodivergent hydroaminocarbonylation of alkenes to primary amides with ammonium chloride
作者:Bao Gao、Guoying Zhang、Xibing Zhou、Hanmin Huang
DOI:10.1039/c7sc04054g
日期:——
the synthesis of primary amides has long been an elusive aim. Here, we report an efficient catalytic system which enables inexpensive NH4Cl to be utilized as a practical alternative to gaseous ammonia for the palladium-catalyzed alkene-hydroaminocarbonylation reaction. Through appropriate choice of the palladium precursors and ligands, either branched or linear primary amides can be obtained in good
Triphosgene and DMAP as Mild Reagents for Chemoselective Dehydration of Tertiary Alcohols
作者:Moshood O. Ganiu、Alexander H. Cleveland、Jarrod L. Paul、Rendy Kartika
DOI:10.1021/acs.orglett.9b01959
日期:2019.7.19
The utility of triphosgene and DMAP as mild reagents for chemoselective dehydration of tertiary alcohols is reported. Performed in dichloromethane at room temperature, this reaction is readily tolerated by a broad scope of substrates, yielding alkenes preferentially with the (E)-geometry. While formation of the Hofmann products is generally favored, a dramatic change in alkene selectivity toward the
The Heck reaction of aryl halides with simple alk-1-enes is a powerful method for the synthesis of ( E)-1-arylalk-1-ene derivatives. The major problem of this reaction is the palladium-catalysed migration of the carbon-carbon double bond along the alkyl chain. We observed that this migration could be partially controlled using appropriate reaction conditions. The ramification of the alkyl chain and
Synthesis of 1,1-Disubstituted Ethenes by Means of Sequential Cross-Coupling Reactions
作者:V. Fiandanese、G. Marchese、F. Naso、L. Ronzini
DOI:10.1055/s-1987-28164
日期:——
A variety of 1-alkenes are synthesized in 63-91% yields by means of sequential cross-coupling reactions of Grignard reagents with readily available or commercial starting materials, in the presence of transition-metal catalysts.