报道了一种合成保护的α-氨基酸的通用有效策略。该方法以丙二酸酯衍生物为起始原料,以Cs 2 CO 3为碱在60度下,通过释放CO 2,以中等收率得到α-氨基酸衍生物。该方法学显示了广泛的底物范围(伯酸和仲酸),出色的官能团耐受性和高效率,可在温和的反应条件下提供所需的产物。它还允许构建β和γ-氨基酸以及其他非天然产物。
There is provided a production method for producing a biarylalanine compound of formula (4):
1
wherein R
1
represents a amino protective group and R
2
represents an amino protective group or a hydrogen atom, R
3
is a carboxy protective group, or the like, and
R
4
is a substituted or unsubstituted aryl or heteroaryl group, characterized by reacting an aromatic amino acid of formula (1)
2
wherein X is a halogen atom or a trifluoromethanesulfonyloxy group, and R
1
, R
2
and R
3
has the same meaning as defined above, with an organic boron compound of formula (2):
3
wherein R
4
has the same meaning as defined above, and Q
1
and Q
2
are the same or different and each is a hydroxy group, an alkoxy group having 1 to 4 carbon atom(s), in the presence of nickel catalyst and a base.
Adducts of peptides and arylboronic acids are attractive tools for the selective recognition of carbohydrates. These structures resemble at least some of the properties of natural carbohydrate binders and have therefore been termed lectin mimetics or boronolectins. In this report, we describe the synthesis of appropriately functionalized benzoboroxoles as modular components for the assembly of boronolectins. These benzoboroxoles have been prepared in a few steps from readily available starting materials. In conclusion, versatile functionalized benzoboroxoles are reported that can be used for the construction of larger conjugates by peptide coupling or copper-mediated cycloadditions (click reactions) with azides.
[EN] OXAMIDE DERIVATIVES, PREPARATION METHOD THEREFOR AND USE THEREOF IN MEDICINE<br/>[FR] DÉRIVÉS D'OXAMIDE, LEUR PROCÉDÉ DE PRÉPARATION ET LEUR UTILISATION EN MÉDECINE<br/>[ZH] 草酰胺类衍生物、其制备方法及其在医药上的应用
Carbamic acid 2-trimethylsilylethyl ester (Teoc-NH2) serves as an ammoniaequivalent in the palladium-catalyzed amination of aryl bromides and aryl chlorides. Anilines with sensitive functional groups can be readily prepared using these amine derivatives.