Stereoisomeric indole compounds, process for the preparation of the same, and use thereof
申请人:Lead Chemical Co., Ltd.
公开号:US06348484B1
公开(公告)日:2002-02-19
Novel stereoisomeric indole compounds of the formula (1), a process for the preparation the same, and use thereof
wherein, Y represents the group
wherein, X represents alkyl group having 1-5 carbon atom(s) (the alkyl group may be substituted with hydroxyl group, carboxyl group, amino group, methylthio group, mercapto group, guanidyl group, imidazolyl group or benzyl group), and R1 and R2 represent each independently hydrogen atom, alkyl group, aralkyl group, cycloalkyl group or aryl group;R represents hydrogen atom, alkyl group, aralkyl group, cycloalkyl group, aryl group, monovalent metal, amine or ammonium; and the symbol ‘*’ represents a position of an asymmetric carbon atom. The above-mentioned compounds can be prepared by condensing tryptophan with a stereoisomeric &agr;-amino acid or carboxylic acid to form an amide form and subjecting or carboxylic acid to form an amide form and subjecting the amide form to oxidative cyclization to form an oxazole ring at once. The compounds exhibit; physiological activities such as inhibitory action against lipid peroxidation, and can be therefore utilized in the form of lipid peroxidation inhibitors containing the same as the active ingredient.
A practical synthesis of the lipophilic side chain of the polyoxypeptins
作者:Miguel Lorca、Michio Kurosu
DOI:10.1016/s0040-4039(01)00205-2
日期:2001.3
The lipophilicsidechain of the cyclic depsipeptide polyoxypeptin A (1) and B (2), strong apoptosis inducers, has been synthesised as an ester of mixed methyl ketal 18. The key step is an asymmetric anti-aldol reaction of the designed 2-(N-2-methylbenzyl-N-2,4,6-trimethylbenzyl) amino-1-phenylpropyl ester 8 by means of a combination of LDA–Cp2ZrCl2 (0.3 equiv.) for enolation and transmetallation into