Enantioselective nickel-catalyzed conjugate addition of dialkylzinc to chalcones using chiral α-amino amides
摘要:
A series of alpha-amino amides derived from natural amino acids (alanine, valine, phenylalanine, isoleucine, and phenylglycine) have been synthesized and fully characterized. Their Ni(II) complexes prepared from Ni(acac)(2) catalyze the enantioselective conjugate addition of diethylzinc to chalcones in high yields and in good enantioselectivities (up to 84%). The side chain of the amino acid and the substituents in the amide nitrogen govern the enantioselectivity of the catalytic process. (c) 2008 Elsevier Ltd. All rights reserved.
Synthesis of Chiral α-Amino-diazoketones on Solid Support: An Access to β-Homologated Amino Acid Derivatives
作者:Jean-Alain Fehrentz、Sonia Cantel、Jean Martinez
DOI:10.1055/s-2004-835639
日期:——
Diazoketone derivatives were obtained on solid support from their corresponding α-amino acids anchored by their N-terminus to the resin. A complete study was performed to optimize the two steps process of this synthesis on solid support: activation of the carboxylic acid function followed by reaction with diazomethane. The obtained diazoketones were then submitted to Wolff rearrangement in the presence of an amine to yield the corresponding homologated amides or in the presence of water to yield the corresponding β-homologated amino acids.
Protecting-Group-Free Amidation of Amino Acids using Lewis Acid Catalysts
作者:Marco T. Sabatini、Valerija Karaluka、Rachel M. Lanigan、Lee T. Boulton、Matthew Badland、Tom D. Sheppard
DOI:10.1002/chem.201800372
日期:2018.5.11
Amidation of unprotected aminoacids has been investigated using a variety of ‘classical“ coupling reagents, stoichiometric or catalytic group(IV) metal salts, and boron Lewis acids. The scope of the reaction was explored through the attempted synthesis of amides derived from twenty natural, and several unnatural, aminoacids, as well as a wide selection of primary and secondary amines. The study also
In this study, we report aminoacidamidation using hexylsilane and a catalytic amount of 1,2,4-triazole. The conventional protection/deprotection method for the α-amino group of aminoacids is not required. The corresponding α-amino amides were obtained in moderate to good yields with low to no racemization.
The present invention provides a urea peptidomimetic boronic compound and pharmaceutical compositions thereof, their preparative methods and uses. The compounds are represented by the following formula (I).
本发明提供了一种脲肽拟硼酸化合物及其药物组合物、其制备方法和用途。这些化合物由下式(I)表示。
[EN] UREA PEPTOID BORIC ACID COMPOUND, PHARMACEUTICAL COMPOSITION THEREOF, PREPARATION METHOD THEREFOR, AND USES THEREOF<br/>[FR] COMPOSÉ D'ACIDE BORIQUE PEPTOÏDE À BASE D'URÉE, COMPOSITION PHARMACEUTIQUE CONTENANT CE COMPOSÉ, PROCÉDÉ DE PRÉPARATION ET UTILISATIONS DE CELUI-CI<br/>[ZH] 脲拟肽硼酸化合物及其药物组合物、制备方法和用途