Monoalkyl and monoanilide yttrium complexes containing tridentate pyridyl-1-azaallyl dianionic ligands
作者:Erli Lu、Wei Gan、Yaofeng Chen
DOI:10.1039/c0dt01539c
日期:——
A series of pyridyl-1-azaallyl ligand precursors (HL1–HL5) were synthesized via condensation of pyridine ketones with anilines. The alkane elimination reactions between Y(CH2SiMe3)3(THF)2 and HL4 or HL5 gave the monoalkyl complexes (L4–H)YCH2SiMe3(THF) (1) and (L5–H)YCH2SiMe3(THF) (2) supported by new tridentate pyridyl-1-azaallyl dianionic ligands. The reactions of monoalkyl complexes, 1 and 2, with one equivalent of 2,6-diisopropylaniline produced the corresponding monoanilide complexes, (L4–H)YNHAr(THF) (3) and (L5–H)YNHAr(THF) (4) (Ar = 2,6-(iPr)2C6H3), via highly selective protonolysis of the terminal alkyl Y–CH2SiMe3 bond. Complexes 1–4 are active for intramolecular hydroamination of aminoalkenes.
Highly Reactive Hydrocarbon Soluble Alkylsodium Reagents for Benzylic Aroylation of Toluenes using Weinreb Amides
作者:David E. Anderson、Andreu Tortajada、Eva Hevia
DOI:10.1002/anie.202218498
日期:2023.3.6
Exploiting coordination effects to prepare hydrocarbon-soluble alkyl organosodium reagents enables the efficient metalation of toluene derivatives under mild and stoichiometric conditions, and their facileconversion into 2-arylacetophenones. Through the isolation of key organometallic intermediates and their study in solution, new mechanistic insights have been gained into these sodium-mediated reactions