1,3-Dipolar Cycloadditions of Diazo Compounds in the Presence of Azides
作者:Matthew R. Aronoff、Brian Gold、Ronald T. Raines
DOI:10.1021/acs.orglett.6b00278
日期:2016.4.1
cellular metabolism is comparable to that of azido groups. However, chemoselectivity has been elusive, as both groups undergo 1,3-dipolarcycloadditions with strained alkynes. Removing strain and tuning dipolarophile electronics yields diazo group selective 1,3-dipolarcycloadditions that can be performed in the presence of an azido group. For example, diazoacetamide but not its azido congener react with
Expedient syntheses of racemic 2,3-diaminopropanoic acid derivatives
作者:Daeock Choi、Kohn Harold
DOI:10.1016/0040-4039(95)01544-2
日期:1995.10
Functionalized 2,3-diaminopropanoic acid derivatives are readily prepared by conjugate addition of amines to dehydroalanine derivatives. The method readily permits differentiation of the two amine groups in substituted 2,3-diaminopropanoic acids and is suitable for the incorporation of substituted β-amino amino acid units within peptides.
Nonenzymatic Asparagine Motif Synthesis by Photoredox-Catalyzed Carbamoylation of Dehydroalanine
作者:Tianyun Guo、Hong Wang、Chuang Wang、Shouchu Tang、Jian Liu、Xiaolei Wang
DOI:10.1021/acs.joc.2c00524
日期:2022.5.20
unexplored. In this article, we describe a photoredox-catalyzed C(sp2) amidation that enables the mutation of Dha to an asparagine (Asn) motif. This amide installation strategy reported herein will guide us to create more additional derivatives of peptides, which may elucidate the mode of action and address an important area of unmet medical need.
Michael Addition of Amines and Thiols to Dehydroalanine Amides: A Remarkable Rate Acceleration in Water
作者:B. Narasimhulu Naidu、Margaret E. Sorenson、Timothy P. Connolly、Yasutsugu Ueda
DOI:10.1021/jo034762z
日期:2003.12.1
In water, the rate of Michael addition of amines and thiols to dehydroalanine amides was greatly accelerated, leading to shorter reaction times and higher yields. The scope of the new conditions was tested with a range of amines, thiols, and dehydroalanine amides. The ease and efficiency of this method provides an attractive route to the synthesis of natural and unnatural amino acid derivatives.