Synthesis of rac-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.svg"><mml:mi>α</mml:mi></mml:math>-aryl propionaldehydes via branched-selective hydroformylation of terminal arylalkenes using water-soluble Rh-PNP catalyst
the substitute on phenyl ring of ligands. These ligands were incorporated into water-soluble rhodium-PNP complex catalysts that were used to regioselective hydroformylation of a series of terminal arylalkenes, providing efficient access to rac-α-aryl propionaldehydes in good to excellent yield (up to 97%) and branched-regioselectivity (up to 40:1 b/l ratio). Furthermore, gram-scale and diverse synthetic
这项工作详细介绍了一类水溶性 PNP 配体的制备,这些配体因配体苯环上取代物的性质而异。这些配体被掺入水溶性铑-PNP络合物催化剂中,用于一系列末端芳基烯烃的区域选择性加氢甲酰化,从而以良好至极好的收率(高达 97%)和支链-区域选择性(高达 40:1 b / l比率)。此外,克级和多样化的合成转化证明了该方法在非甾体抗炎药中的合成应用。
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
By using a heterobimetallic catalyst, (CO)4(PEtPh2)W(μ-PPh2)Rh(CO)(PPh3), chemoselective hydroformylation of monosubstituted alkenes proceeds efficiently at room temperature under atmospheric pressure of CO/H2, without affecting functional groups such as disubstituted alkene moieties, aryl and alkenyl iodide moieties, and hydroxy and carboxy groups.
The invention relates to novel polyalkylene glycol compounds and methods of using them. In particular, compounds comprising a novel polyethylene glycol conjugate are used alone, or in combination with antiviral agents to treat a viral infection, such as chronic hepatitis C.
The invention relates to novel polyalkylene glycol compounds and methods of using them. In particular, compounds comprising a novel polyethylene glycol conjugate are used alone, or in combination with antiviral agents to treat a viral infection, such as chronic hepatitis C.