Ruthenium catalyzed β-selective alkylation of vinylpyridines with aldehydes/ketones <i>via</i> N<sub>2</sub>H<sub>4</sub> mediated deoxygenative couplings
作者:Leiyang Lv、Chao-Jun Li
DOI:10.1039/d0sc06586b
日期:——
aldehyde/ketones via N2H4 mediated deoxygenative couplings. Compared with one-electron umpolung of carbonyls to alcohols, this two-electron umpolung strategy realized reductive deoxygenation targets, which were not only applicable to the regioselective alkylation of a broad range of 2/4-alkene substituted pyridines, but also amenable to challenging 3-vinyl and steric-embedded internal pyridines as well as their
Double Addition Reactions Involving Vinyl-Substituted N-Heterocycles and Active Methylene Compounds
作者:Jacob C. Hood、Yannick Tshikaya、Aaren R. Manz、Marcus C. LaPorte、Douglas A. Klumpp
DOI:10.1021/acs.joc.1c02655
日期:2022.4.1
of conjugate addition reactions have been performed with vinyl-substituted N-heterocycles in acid-catalyzed conversions. Using activemethylene compounds, double conjugate addition reactions have been accomplished to provide dipyridyl and related heterocyclic products. These conversions have utilized 1,3-dicarbonyl compounds, cyano esters, a cyano sulfone, and malonyl nitrile as nucleophiles. The Michael
New Synthetic Applications of Indium Organometallics in Cross-Coupling Reactions
作者:José Pérez Sestelo、Luis A. Sarandeses、Miguel A. Pena
DOI:10.1055/s-2004-834945
日期:——
The use of indium organometallics in multifold and sequential cross-coupling reactions is reported. Triorganoindium reagents (R3In) react, under palladium catalysis, with oligohaloarenes affording the multiple cross-coupling products in a single operation. In the reaction, the three organic groups (alkyl, aryl, alkenyl or alkynyl) attached to indium are efficiently transferred to the electrophile, with only a slight excess of organometallic reagent. We demonstrate that indium organometallics are useful reagents for sequential cross-coupling reactions. This reaction illustrates the high chemoselectivity of R3In.
Multifold and sequential cross-coupling reactions with indium organometallics
作者:Miguel A. Pena、Ignacio Pérez、José Pérez Sestelo、Luis A. Sarandeses
DOI:10.1039/b206346h
日期:——
Multifold and sequential palladium-catalyzed cross-coupling reactions can be performed between triorganoindiumcompounds and oligohaloarenes using only a small excess of the organometallic reagent, low catalyst charge loading and short reaction times.
Process for preparing branched alcohols of the general formula (I)
where the groups R
1
are different or identical and selected from C
2
-C
3
-alkyl, linear or branched, using at least one alcohol of the formula (II)
R
1
—CH
2
—CH
2
—OH (II)
in homogeneous phase
in the presence of at least one base,
wherein at least one Ru(II)-containing complex compound is used in which the Ru(II) has at least one ligand L
1
which is at least bidentate, where at least one coordination site of L
1
is a nitrogen atom.