A convenient and efficient synthesis of substituted quinolines via a simple one-pot reaction of an aniline, an aromatic aldehyde, and an enolizable aliphatic aldehyde in the presence of the iridium catalyst [IrCl2H(cod)]2 under oxygen as an oxidant was developed. The reaction proceeds with Mannich-type imine formation followed by nucleophilic addition to give β-amino aldehydes. Dehydrative cyclization takes place to give dihydroquinoline, which is then dehydrogenated by aerobic oxidation to give 2-aryl-3-alkylquinolines. Dialkylquinolines were obtained by the reaction with anilines and aliphatic aldehydes in good yields.
Stereoselective Peterson Olefinations from Bench-Stable Reagents and<i>N</i>-Phenyl Imines
作者:Manas Das、Atul Manvar、Maïwenn Jacolot、Marco Blangetti、Roderick C. Jones、Donal F. O'Shea
DOI:10.1002/chem.201500475
日期:2015.6.8
The synthesis of bench‐stable α,α‐bis(trimethylsilyl)toluenes and tris(trimethylsilyl)methane is described and their use in stereoselective Peterson olefinations has been achieved with a wide substrate scope. Product stereoselectivity was poor with carbonyl electrophiles (E/Z ∼1:1 to 4:1) though this was significantly improved by employing the corresponding substituted N‐benzylideneaniline (up to 99:1)
[EN] NOVEL (1,3-BUTADIEN-2-YL)METHYLAMINE DERIVATIVES AND PREPARATION METHOD THEREOF<br/>[FR] NOUVEAUX DÉRIVÉS DE (1,3-BUTADIÈNE-2-YL)MÉTHYLAMINE ET PROCÉDÉ DE PRÉPARATION DE CEUX-CI
申请人:KNU INDUSTRY COOPERATION FOUND
公开号:WO2010035948A1
公开(公告)日:2010-04-01
The present invention provides a novel (1,3-butadien-2-yl)methylamine derivative and a preparation method thereof. The (1,3-butadien-2-yl)methylamine derivative having the 1,3-diene substituent at the alpha-position is an useful precursor in preparing various amine compounds having biochemical activities.
A thiol-promoted site-specific addition of 1,3-dioxolane to imines through a radical chain process is described. This process represents a metal-free and redox-neutral way to convert inexpensive materials to a broad range of protected α-amino aldehydes in good to excellent yields using only a catalytic amount of radical precursor. Control experiments revealed that both the thiol and a small amount
Novel Synthesis of <i>g</i><i>em</i>-Dichloroaziridines from Imines via the KF/Al<sub>2</sub>O<sub>3</sub>-Promoted Generation of Dichlorocarbene from Chloroform
KF/Al2O3 was found to be an efficient base for the reaction of imines with chloroform in acetonitrile to give gem-dichloroaziridines 2 in moderate to high yields. The KF/Al2O3-promoted dichloroaziridination can be carried out with simple workup, tolerates a variety of functional groups present in the imines, and proceeds smoothly with a smaller amount of carbene source.
发现KF / Al 2 O 3是亚胺与氯仿在乙腈中反应以中等至高收率得到宝石-二氯氮丙啶2的有效碱。可以通过简单的后处理进行KF / Al 2 O 3促进的二氯叠氮基化,耐受亚胺中存在的各种官能团,并使用较少量的卡宾源平稳地进行。