Synthesis of indole alkaloid (−)-corynantheidol and formal synthesis of (−)-corynantheidine via one-pot asymmetric azaelectrocyclization
作者:Yanwu Li、Toyoharu Kobayashi、Shigeo Katsumura
DOI:10.1016/j.tetlet.2009.05.045
日期:2009.8
The highly efficient asymmetric total synthesis of indolealkaloid, (−)-corynantheidol, containing a 2,4,5-trisubstituted piperidine core, was achieved using a new version of the one-pot azaelectrocyclization reaction. The formal synthesis of (−)-corynantheidine was also achieved using the common synthetic intermediate for these corynantheines.
The stereocontrolled synthetic procedure for the preparation of 2,4,5-trisubstituted 2,5-chiral 1,2,5,6-tetrahydropyridines was established using a one-pot asymmetric azaelectrocyclization protocol; the generality of this protocol was demonstrated by synthesizing the title compounds with various aryl and alkenyl substituents at the C-2 position.
METHOD FOR SYNTHESIS OF KETO ACIDS OR AMINO ACIDS BY HYDRATION OF ACETYLENE COMPOUND
申请人:Ogo Seiji
公开号:US20090216044A1
公开(公告)日:2009-08-27
An object of the present invention is to provide a method for synthesis of keto acids by hydration of an acetylene compound (acetylene-carboxylic acids) under mild conditions free from harmful mercury catalysts and a method for synthesis of amino acids from acetylene-carboxylic acids in a single container (one-pot or tandem synthesis). In one embodiment of the method according to the present invention for synthesis of keto acids, acetylene-carboxylic acids is hydrated in the presence of a metal salt represented by General Formula (1),
where M
1
represents an element in Group VIII, IX, or X of the periodic table, and X
1
, X
2
, or X
3
ligand represents halogen, H
2
O, or a solvent molecule, and k represents a valence of a cation species, and Y represents an anion species, and L represents a valence of the anion species, and each of K and L independently represents 1 or 2, and k×m=L×n.
METHOD FOR SYNTHESIS OF KETO ACID OR AMINO ACID BY HYDRATION OF ACETHYLENE COMPOUND
申请人:Japan Science and Technology Agency
公开号:EP1932824A1
公开(公告)日:2008-06-18
An object of the present invention is to provide a method for synthesis of keto acids by hydration of an acetylene compound (acetylene-carboxylic acids) under mild conditions free from harmful mercury catalysts and a method for synthesis of amino acids from acetylene-carboxylic acids in a single container (one-pot or tandem synthesis). In one embodiment of the method according to the present invention for synthesis of keto acids, acetylene-carboxylic acids is hydrated in the presence of a metal salt represented by General Formula (1),
where M1 represents an element in Group VIII, IX, or X of the periodic table, and X1, X2, or X3 ligand represents halogen, H2O, or a solvent molecule, and k represents a valence of a cation species, and Y represents an anion species, and L represents a valence of the anion species, and each of K and L independently represents 1 or 2, and k × m = L × n.
本发明的目的是提供一种在温和条件下通过水合乙炔化合物(乙炔-羧酸)合成酮酸的方法,不使用有害的汞催化剂,以及一种在单个容器中从乙炔-羧酸合成氨基酸的方法(单锅或串联合成)。在根据本发明合成酮酸的方法的一个实施方案中,乙炔-羧酸在通式(1)代表的金属盐存在下水合、
其中 M1 代表元素周期表第 VIII、IX 或 X 族中的元素,X1、X2 或 X3 配体代表卤素、H2O 或溶剂分子,K 代表阳离子种类的价数,Y 代表阴离子种类,L 代表阴离子种类的价数,K 和 L 各自独立地代表 1 或 2,且 k × m = L × n。