作者:Marine Pinaud、Emilie Plantiveau、Eric Huet、Erwan Le Gall、Marc Presset
DOI:10.1002/ejoc.202300572
日期:2023.8.21
The addition of alkylzinc halides to imines has been studied under different conditions. Whereas Mannich-type reactions with sulfonyl imines occurs upon simple heating, the use N-alkyl imines required an additional activation: the use of acetyl chloride led to the preparation of N-acyl tertiary amines whereas trimethylsilyl chloride afforded a direct access to unprotected secondary amines.
Three-Component Synthesis of α-Branched Amines under Barbier-like Conditions
作者:Erwan Le Gall、Caroline Haurena、Stéphane Sengmany、Thierry Martens、Michel Troupel
DOI:10.1021/jo901704s
日期:2009.10.16
An array of alpha-branched amines has been prepared by using an expedient three-component Mannich-type reaction among organic halides, aldehyde derivatives, and amines. The experimental procedure, which is characterized by its simplicity, employs zinc dust for the in situ generation of organozinc reagents. We show that this Barbier-like protocol constitutes a useful entry to diaryl-methylamines, 1,2-diarylethylamines, alpha- or beta-amino esters, benzylamines, and beta-arylethylamines.
Analgesics. I. N-Alkylated-1,2-diphenylethylamines Prepared by the Leuckart Reaction
作者:L. H. Goodson、C. J. W. Wiegand、Janet S. Splitter
DOI:10.1021/ja01215a018
日期:1946.11
Cp*<sub>2</sub>TiMe<sub>2</sub>: An Improved Catalyst for the Intermolecular Addition of <i>n</i>-Alkyl- and Benzylamines to Alkynes
作者:Andreas Heutling、Sven Doye
DOI:10.1021/jo016311p
日期:2002.3.1
Cp*2TiMe2 has been found to be a competent catalyst for the intermolecular addition of sterically less demanding n-alkyl- and benzylamines to internal alkynes. In the presence of 2.0-6.0 mol % of the catalyst, hydroamination reactions between n-propyl-, n-hexyl-, benzyl-, p-methoxybenzyl- or 2-phenylethylamine and diphenylacetylene, 3-hexyne or 4-octyne go to completion within 24 h or less at 114 degreesC (oil bath temperature). After subsequent reduction of the initially formed imines with zinc-modified sodium cyanoborohydride in MeOH at 25 degreesC, the corresponding secondary amines can be isolated in excellent yields (>78%). Hydroamination/reduction sequences employing the unsymmetrically substituted alkyne 1-phenylpropyne give access to mixtures of regioisomeric secondary amines. The observed regioselectivity is low.
[Ind2TiMe2]: A General Catalyst for the Intermolecular Hydroamination of Alkynes
作者:Andreas Heutling、Frauke Pohlki、Sven Doye
DOI:10.1002/chem.200305771
日期:2004.6.21
concentration of the employed amine. Furthermore, no dimerization of the catalytically active imido complex is observed in the hydroamination of 1-phenylpropyne with 4-methylaniline in the presence of [Ind(2)TiMe(2)] as catalyst. In general, a combination of [Ind(2)TiMe(2)]-catalyzed hydroamination of alkynes with subsequent reduction leads to the formation of secondary amines with good to excellent yields