Organomanganese (II) reagents XV. Conjugate addition of organomanganese reagents to alkylidenemalonic esters and related compounds
作者:Gérard Cahiez、Mouad Alami
DOI:10.1016/s0040-4020(01)81312-0
日期:1989.1
Organomanganese reagents react with alkylidenemalonic esters or related compounds to give the conjugateaddition products in good yields. Several examples illustrate the scope and the efficiency of this reaction
Catalytic enantioselective conjugate additions with easily accessible alkenylboronic acid pinacol esters as nucleophiles promoted by chiral copper complexes of N-heterocyclic carbenes are presented. These processes constitute an unprecedented instance of conjugate additions of a variety of functionalized alkenyl groups and afford desired products that are otherwise difficult to access in up to 98%
A new reactivity pattern for vinyl bromides: cine-substitution via palladium catalysed C–N coupling/Michael addition reactions
作者:Michael C. Willis、Jay Chauhan、William G. Whittingham
DOI:10.1039/b508464d
日期:——
formation can be used to convert vinyl bromides to the corresponding enamines, which are reacted in situ with alkylidene malonates to provide Michael adducts. The overall transformation results in cine-substitution of the starting vinyl bromide.
Asymmetric conjugate addition to alkylidene malonates
作者:Alexandre Alexakis、Cyril Benhaim
DOI:10.1016/s0957-4166(01)00196-3
日期:2001.5
Dialkylzinc and trialkylaluminium reagents undergo conjugateaddition to alkylidene malonates with 0.5% copper triflate as catalyst. The reaction could be made enantioselective by completing the reaction in the presence of 0.5–1.0 mol% of chiral phosphorus ligand. Enantiomeric excesses (e.e.s) of up to 73% could be attained with a ligand prepared from TADDOL and 2-naphthylcyclohexanol.