Synthesis and Characterization of Organolanthanide Complexes with a Calix[4]-pyrrolyl Ligand and Their Catalytic Activities toward Hydrophosphonylation of Aldehydes and Unactivated Ketones
The alkali metal salt free dinuclear trivalent lanthanide amido complexes (eta(5):eta(1):eta(5):eta(1)-Et-8-calix[4]-pyrrolyl)LnN-(SiMe3)(2)}(2) (Ln = Nd (2), Sm (3), Gd (4)) were prepared through the silylamine elimination reactions of calix[4]-pyrrole [Et2C(C4H2NH)](4) (1) with 2 equiv of [(Me3Si)(2)N](3)Ln(mu-Cl)Li(THF)(3) (Ln = Nd, Sm, Gd) in toluene at 110 degrees C. The complexes were fully characterized by elemental, spectroscopic, and single-crystal X-ray analyses. Studies on the catalytic activity of the new lanthanide amido complexes revealed that these complexes can be used as efficient catalysts for hydrophosphonylation of aldehydes and unactivated ketones, affording the products in high yields by employing a low catalyst loading (0.1 mol %) at room temperature in a short time (20 min). Noteworthy is that it is the first application of calix[4]-pyrrolyl-supported lanthanide amides as catalysts to catalyze the hydrophosphonylation of aldehydes and unactivated ketones under mild conditions.
Oussaid, Boualem; Diallo, Ousmane; Soufiaoui, Mohammed, Bulletin de la Societe Chimique de France, 1995, vol. 132, # 4, p. 461 - 466
作者:Oussaid, Boualem、Diallo, Ousmane、Soufiaoui, Mohammed、Garrigues, Bernard
DOI:——
日期:——
<i>O</i>-Allylated Pudovik and Passerini Adducts as Versatile Scaffolds for Product Diversification
作者:Mansour Dolé Kerim、Tania Katsina、Martin Cattoen、Nicolas Fincias、Stellios Arseniyadis、Laurent El Kaïm
DOI:10.1021/acs.joc.0c01721
日期:2020.10.2
The palladium-catalyzed O-allylation of α-hydroxyphosphonates and α-hydroxyamides obtained from Pudovik and Passerini multicomponent reactions has allowed interesting and highly straightforward access to a variety of building blocks for product diversification. These post-functionalizations include a selective base- or ruthenium hydride-mediated isomerization/Claisen rearrangement cascade and a ring-closing
Abstract 2-Thienyl-phosphonylcarbinols in acidic medium gave with alcohols and aromatic derivatives two classes of new compounds depending on the reaction temperature.