A general and mild CuCl-TBAT-catalyzed allylation of aldehydes, ketones, and imines was developed using allyltrimethoxysilane as the allylating reagent. Mechanism studies indicated that the copper alkoxide, allylfluorodimethoxysilane, and allyltrimethoxysilane are essential to promote the reaction efficiently.
S. Yamasaki, K. Fujii, R. Wada, M. Kanai, M. Shibasaki, J. Am. Chem. Soc., 2002, 124, 6536-6537.
A palladium complex catalyzes two transformations in one pot: formation of allylsilane from allyl trifluoroacetate using hexamethyldisilane and subsequent imine allylation. A three-component reaction was developed where preformed imines were replaced with aldehydes and anisidine. Under these reaction conditions various aldehydes react smoothly to afford homoallylic amines.
R. E. Grote, E. R. Jarvo, Org. Lett., 2009, 11, 485-488.
An enantioselective synthesis of homoallylamides through reactions of stable and easily accessible (pinacolato)allylborons with aryl-, heteroaryl-, alkyl-, or alkenyl-substituted N-phosphinoylimines is promoted by 1-5 mol % of readily accessible NHC-Cu complexes, derived from C1-symmetric imidazolinium salts. Allyl additions deliver the desired products in very good yield and enantiomeric ratio.
E. M. Vieira, M. L. Snapper, A. H. Hoveyda, J. Am. Chem. Soc., 2011, 133, 3332-3335.
A highly α-regioselective prenylation of imines enables the conversion a wide range of substrates including N- and C-aryl aldimines, N-alkyl aldimines, C-alkyl aldimines, and N- and C-aryl ketimines. The approach uses prenyl bromide as prenyl source and inexpensive zinc as mediator as well as environmentally benign 1,3-dimethyl-2-imidazolidinone (DMI) as solvent.
L.-M. Zhao, S.-Q. Zhang, H.-S. Jin, L.-J. Wan, F. Dou, Org. Lett., 2012, 14, 886-889.
A highly efficient three-component coupling reaction between thioformamides and organolithium and Grignard reagents was developed. The generality of the process has been demonstrated by using various combinations of reactants and reagents.
T. Murai, F. Asai, J. Am. Chem. Soc., 2007, 129, 780-781.
Homoallylic α-amino esters and amines were prepared via a Pd(II)-catalyzed coupling of 1,2-nonadiene and boronic acids with ethyl iminoacetate or aliphatic, aromatic, and heteroaromatic imines.
C. D. Hopkins, H. C. Malinakova, Org. Lett., 2006, 8, 5971-5974.
An asymmetric vinylogous Mannich reaction of α,α-dicyanoolefins and N-Boc aldimines is promoted by a simple chiral bifunctional thiourea-tertiary amine organocatalyst. The reaction was highly efficient, regio-, and stereoselective at room temperature for a broad range of substrates.
T.-Y. Liu, H.-L. Cui, J. Long, B.-J. Li, Y. Wu, L.-S. Ding, Y.-C. Chen, J. Am. Chem. Soc., 2007, 129, 1878-1879.