An Alumino-Mannich Reaction of Organoaluminum Reagents, Silylated Amines, and Aldehydes
作者:Anika Tarasewicz、Deeba Ensan、Robert A. Batey
DOI:10.1002/chem.201801012
日期:2018.4.20
A multi‐component coupling using organoaluminum reagents, silylated amines, and aldehydes results in the formation of tertiary amines. Both alkenyl‐ and alkylaluminum reagents undergo reaction with iminium ion substrates for which the corresponding Petasis borono‐Mannichreactions are unsuccessful.
Readily available alkenylalanes, arising from hydroalumination of unprotected terminal alkynes, have been directly employed for the copper-catalyzedasymmetricconjugateaddition (ACA) to β-substituted cyclic enones. The desired products, containing a quaternary stereogenic center, are generally obtained in good yields and enantioselectivities.
Copper-Catalyzed Asymmetric 1,4-Addition of Alkenyl Alanes to <i>N</i>-Substituted-2-3-dehydro-4-piperidones
作者:Daniel Müller、Alexandre Alexakis
DOI:10.1021/ol3004436
日期:2012.4.6
Readily available vinyl alanes are used in the Cu-catalyzed asymmetric conjugate addition reaction to N-substituted-2-3-dehydro-4-piperidones. The enhanced reactivity of recently developed and easily prepared phosphine amine ligands in combination with inexpensive Cu(II)naphtenate (CuNp) allows the introduction of a great variety of alkenyl, alkyl, and aryl aluminums in high enantioselectivity.