Vinyl-copper derivatives XII : Stereospecific synthesis of allylic amines by aminomethylation of organocopper reagents
作者:C. Germon、A. Alexakis、J.F. Normant
DOI:10.1016/0040-4039(80)80172-9
日期:1980.1
the carbocupration or hydroalumination of alkynes followed by amino-methylation yields allylic amines. The stereochemical integrity of the alkenyl moiety is completely retained in both cases.
Iridium complex-catalyzed allylic amination of allylic carbonates was studied. The solvent strongly affected the catalytic activity. The use of a polar solvent such as EtOH is essential for obtaining the products in high yield, The reaction of (E)-3-substituted-2-propenyl carbonate and 1-substituted-2-propenyl carbonate with pyrrolidine in the presence of a catalytic amount of [Ir(COD)Cl](2) and P(OPh)(3) (P/Ir = 2) gave a branch amine with up to 99% selectivity. Both secondary and primary amines could be used for this reaction. When a primary amine was used, selective monoallylation occurred. No diallylation product was obtained. The reaction of 1,1-disubstituted-2 propenyl acetate with amines exclusively gave an alpha,alpha -disubstituted allylic amine. This reaction provides an alternative route to the addition of an organometallic reagent to ketimines. for the preparation of such amines. The reaction of (Z)-3-substituted-2-propenyl carbonate with amines gave (Z)-linear amines with up to 100% selectivity. In all cases, no (E)-linear amine was obtained. The selectivities described here have not been achieved in similar palladium complex-catalyzed reactions.
Complete Retention of <i>Z</i> Geometry in Allylic Substitution Catalyzed by an Iridium Complex
作者:Ryo Takeuchi、Norihito Shiga
DOI:10.1021/ol990033n
日期:1999.7.1
[GRAPHICS]The Z geometry of methyl (Z)-3-monosubstituted-2-alkenyl carbonate was completely retained in iridium complex-catalyzed allylic amination. The reaction of methyl (Z)-2-nonenyl carbonate with piperidine in the presence of a catalytic amount of [Ir(COD)Cl](2) and P(OPh)(3) at 50 degrees C for 2 h gave a 98:2 mixture of (Z)-1-(2-nonenyl)piperidine and 1-(1-n-hexyl-2-propenyl)piperidine in 86% yield, No E isomer was obtained. Various (Z) allylic amines were obtained in 91-100% selectivity by allylic amination of methyl (Z) 3-monosubstituted-2-alkenyl carbonate.
GERMON C.; ALEXAKIS A.; NORMANT J. F., TETRAHEDRON LETT., 1980, 21, NO 39, 3763-3766
作者:GERMON C.、 ALEXAKIS A.、 NORMANT J. F.
DOI:——
日期:——
GERMON, C.;ALEXAKIS, A.;NORMANT, J. F., BULL. SOC. CHIM. FR., 1984, N 9-10, 377-389