A novel consecutive three-component Heck-isomerization-Wittig sequence by way of in situ generated aldehydes
作者:Jesco Panther、Adalbert Röhrich、Thomas J. J. Müller
DOI:10.3998/ark.5550190.0013.321
日期:——
A novelconsecutivethree-component four step synthesis of 5-(hetero)arylpent-2-enoates has been disclosed. Various (hetero)aryl iodides can be coupled with allyl alcohol under Heck conditions to give 3-(hetero)arylpropionaldehyde in termediates, which were transformed without isolation with in situgenerated stabilized phosphorus ylides to furnish 5-(hetero)arylpent-2enoates in moderate to excellent
is driven by a novel activation strategy and features a unique Pd(I)-Pd(I) mechanism, involving an iodide-assisted binuclear step to release the product. This method enables β-selective hydroformylation of a large range of alkenes and alkynes, including sensitive starting materials. Its utility is demonstrated in the synthesis of antiobesity drug Rimonabant and anti-HIV agent PNU-32945. In a broader
Heck arylation of allyl alcohol catalyzed by Pd(0) nanoparticles
作者:Stanisława Tarnowicz、Waleed Alsalahi、Ewa Mieczyńska、Anna M. Trzeciak
DOI:10.1016/j.tet.2017.03.034
日期:2017.9
Pd(OAc)2 in water at 80 °C in the presence of a PVP-stabilizing polymer. Pd(0) NPs were successfully used in the Heckcoupling of allyl alcohol with iodo- and bromobenzenes. Iodobenzenes reacted under solventless conditions or in DMF solution producing 3-arylpropanals and 2-arylpropanals as the main products. The same products were obtained in the reaction of bromobenzene in TBAB as the reaction medium
Iron‐Catalyzed Magnesium‐Mediated Formal Hydroformylation of Alkynes and Alkenes
作者:Tanuja Tewari、Rohit Kumar、Samir H. Chikkali
DOI:10.1002/cctc.202201394
日期:2023.2.8
been the work-horse metal for traditional hydroformylation. Herein, we report an earth-abundant iron catalyst for the formal hydroformylation of alkynes and alkenes. The iron catalyst transforms alkynes and alkenes to aldehydes in the presence of magnesium reagent and dimethylformamide, thus offering a syngas cylinder-free safe alternative to high-pressure hydroformylation.