High anti Diastereoselectivity in a Tandem Oxyhomologation–Coupling Protocol for the Preparation of Amides and Peptides Incorporating α-Hydroxy β-Amino Acids
作者:Xuefeng He、Régis Guillot、Sandrine Deloisy、David J. Aitken
DOI:10.1021/acs.orglett.4c00370
日期:2024.3.22
N-dibenzyl-l-phenylalaninal and coupling with nitrogen nucleophiles to provide a wide selection of amide and peptide derivatives of (2S,3S)-allophenylnorstatin in generally good yields and with high anti selectivity, often with dr >98:2. The procedure works equally well with other selected N,N-dibenzyl α-amino aldehydes, and is used to achieve a very short synthesis of (2S,3S,S)-epibestatin.
一锅法 MAC(掩蔽酰基氰化物)反应用于进行N,N-二苄基-l-苯丙醛的串联氧同系化反应,并与氮亲核试剂偶联,提供多种 (2 S ,3 S )-别苯基去甲他汀通常具有良好的收率和高抗选择性,通常 dr >98:2。该程序与其他选定的N,N -二苄基 α-氨基醛同样有效,并且用于实现 (2 S, 3 S,S )-表贝他汀的非常短的合成。
Synthesis and structure-activity relations of bestatin analogs, inhibitors of aminopeptidase B
Stereoisomers and analogues of bestatin, [(2S,3R)-3-amino-2-hydroxy-4-phenylbutanoyl]-L-leucine, were synthesized and tested for aminopeptidase B and leucine aminopeptidase inhibiting activity. Among the eight stereoisomers, the 2S stereoisomers exhibited strong activity. In a series of compounds in which the L-leucine residue of bestatin was substituted with other amino acids, only the one containing isoleucine showed more activity than bestatin. Norleucine, norvaline, methionine, valine, serine, glutamine, phenylalanine, glutamic acid, proline, and lysine analogues gave, in that order, decreasing activity. Alkyl and phenyl sub stitution for the benzyl group of bestatin decreased the activity markedly. p-Methyl-, p-chloro-, and p-nitrobestatins showed greater activity than bestatin.
Compositions and methods for the treatment of neurodegenerative diseases
申请人:Staunton Jane
公开号:US20060270742A1
公开(公告)日:2006-11-30
The invention features compositions and methods for the treatment of neurodegenerative diseases.