Intramolecular aminopalladation of alkynylamines gave intermediary alkenylpalladium compounds that hydrolyzed and isomerized to thermodynamically stable cyclic imines. Treatment of 3-alkynylamines with a catalytic amount of PdCl2(MeCN)2 gave exclusively 1-pyrrolines in good yields; 5-alkynylamines afforded 2,3,4,5-tetrahydropyridines selectively. Treatment of 4-alkynylamines with Pd(II) afforded mixtures of both 5- and 6-membered cyclic imines. Applications to the synthesis of some naturally occurring alkaloids are also described.
Preparation of 2,3,4,5-Tetrahydropyridines from 5-Alkynylamines Under the Catalytic Action of Gold(III) Salts
作者:Yukitoshi Fukuda、Kiitiro Utimoto
DOI:10.1055/s-1991-26621
日期:——
Intramolecular addition of amine to carbon-carbon triple bonds in 5-alkynylamines produces 2,3,4,5-tetrahydropyridines under the catalytic action of an aurate salt. Some venom components of various ant species are synthesized by the application of this reaction.
The Cp2TiMe2-catalyzed intramolecular hydroamination/cyclization of aminoalkynes
作者:Igor Bytschkov、Sven Doye
DOI:10.1016/s0040-4039(02)00644-5
日期:2002.5
Cp2TiMe2 has been found to be a competent catalyst for the intramolecularhydroamination/cyclization of aminoalkynes. In the presence of 5.0 mol% Cp2TiMe2, the hydroamination reactions proceed smoothly at 100–110°C to give five- and six-membered cyclic imines within 4–6 h. After subsequent reduction performed with zinc-modified NaBH3CN at room temperature cyclic amines can be isolated in good yields
已经发现Cp 2 TiMe 2是氨基炔的分子内加氢胺化/环化的有效催化剂。在5.0 mol%Cp 2 TiMe 2的存在下,加氢胺化反应在100–110°C进行得很顺利,在4–6 h内可生成五元和六元环状亚胺。随后在室温下用锌改性的NaBH 3 CN还原后,可以良好的收率分离出环胺。