Acyldemetallation of titanium(III) π-allylic complexes
作者:A.N. Kasatkin、A.N. Kulak、G.A. Tolstikov
DOI:10.1016/0022-328x(88)87004-9
日期:1988.5
Titanium(III) π-allyliccomplexes, prepared by the interaction of 1,3-dienes or trienes with Cp2TiCl2 and n-PrMgBr, react with carboxylic acid chlorides RCOCl (R = alkyl, aryl, alkenyl) to give β, γ-unsaturated ketones in high yields. The reaction takes place at the most substituted carbon atom of the π-allylic ligand.
three-component couplingreaction of aldehydes, 1,3-dienes, and alkenylzirconium reagents was realized. The ligand- and additive-free protocol afforded a convenient approach to the synthesis of skipped diene compounds bearing various functionals (e.g., hydroxyl, carbonyl, halide) and heterocyclic groups. The products were readily transformed into structurally diverse polyenes. The utility of this reaction was
Hydroxoiridium/Chiral Diene Complexes as Effective Catalysts for Asymmetric Annulation of α-Oxo- and Iminocarboxamides with 1,3-Dienes
作者:Miyuki Hatano、Takahiro Nishimura
DOI:10.1002/anie.201505382
日期:2015.9.7
The asymmetric [3+2] annulation of α‐oxo‐ and α‐iminocarboxamides with 1,3‐dienes catalyzed by hydroxoiridium/chiraldienecomplexes was realized, giving high yields of the corresponding γ‐lactams with high enantioselectivity.
Iridium-catalyzed stereoselective [3+2] annulation of α-oxocarboxylic acids with 1,3-dienes
作者:Ryota Yabe、Yusuke Ebe、Takahiro Nishimura
DOI:10.1039/d1cc02003j
日期:——
The stereoselective annulation of α-oxocarboxylic acids with 1,3-dienes proceeded in the presence of a hydroxoiridiumcatalyst to give α-hydroxy-γ-lactones in good yields with high 3,5-trans relative stereochemistry. The use of a chiraldiene ligand for a cationic iridium complex enabled asymmetricannulation with high enantioselectivity.
The cross-coupling reactions of 2-(1,3-butadienyl)magnesium chloride (1) with aryl and alkyl iodides were investigated in the presence of transition metal catalysts. Tetrakis(triphenylphosphine)pal...