AZA-DIBENZOCYCLOOCTYNES AND METHODS OF MAKING AND USING SAME
申请人:POPIK VLADIMIR V.
公开号:US20120029186A1
公开(公告)日:2012-02-02
Convenient methods of preparing aza-dibenzocyclooctynes are disclosed herein. Aza-dibenzocyclooctynes attached to a surface are also disclosed herein. Aza-dibenzocyclooctynes can be reacted with azides to form heterocyclic compounds. Such reactions can be useful in a wide variety of applications including, for example, labeling surfaces.
Stereochemistry of catabolism of the RNA base uracil
作者:David Gani、Douglas W. Young
DOI:10.1039/p19850001355
日期:——
A mammalian enzyme system has been used to study the stereochemistry of the catabolism of the pyrimidine uracil (1) to the amino acid β-alanine (4). Use of [5-2H]- and [6-2H]-uracils and of 2H2O in the incubations yielded stereospecifically deuteriated samples of β-alanine. Assays, involving total synthesis of samples of β-alanine unambiguously labelled with deuterium in each of the four C–H bonds
哺乳动物酶系统已用于研究嘧啶尿嘧啶(1)分解为氨基酸β-丙氨酸(4)的立体化学。在培养中使用[5- 2 H]-和[6- 2 H]-尿嘧啶和2 H 2 O产生β-丙氨酸的立体特异性氘化样品。测定法,涉及β丙氨酸在四个C-H键的氘明确地标记的样本的总合成已经显示的是,在分解代谢过程中的第一步,尿嘧啶是通过二氢脱氢酶降低与整体抗加入氢气,在SI在C-6面和SI面在C-5。
Surface Functionalization Using Catalyst-Free Azide−Alkyne Cycloaddition
作者:Alexander Kuzmin、Andrei Poloukhtine、Margreet A. Wolfert、Vladimir V. Popik
DOI:10.1021/bc100306u
日期:2010.11.17
The utility of catalyst-free azide-alkyne [3 + 2] cycloaddition for the immobilization of a variety of molecules onto a solid surface and microbeads was demonstrated. In this process, the surfaces are derivatized with aza-dibenzocyclooctyne (ADIBO) for the immobilization of azide-tagged substrates via a copper-free click reaction. Alternatively, ADIBO-conjugated molecules are anchored to the azide-derivatized surface. Both immobilization techniques work well in aqueous solutions and show excellent kinetics under ambient conditions. We report an efficient synthesis of aza-dibenzocyclooctyne (ADIBO), thus far the most reactive cyclooctyne in cycloaddition to azides. We also describe convenient methods for the conjugation of ADIBO with a variety of molecules directly or via a PEG linker.
N-trifluoroacetyl-β-alanine in the synthesis of carnosine
作者:M. S. Cherevin、Z. P. Zubreichuk、L. A. Popova、T. G. Gulevich、V. A. Knizhnikov
DOI:10.1134/s1070363207090125
日期:2007.9
Conditions have been developed for the synthesis of N-trifluoroacetyl-beta- alanine, N-tifluoroacetylalanyl chloride, and N-trifluoroacetyl- alanine 4-nitrophenyl ester. These compounds reacted with histidine methyl ester or sodium salt to give N-trifluoroacetyl-beta-alanyl-L-histidine methyl ester CF3CONHCH2CH2 center dot CONHCH( CH2C3H3N2) COOCH3 and N-trifluoroacetyl-beta-alanyl-L-histidine CF3CONHCH2CH2CONHCH center dot(CH2C3H3N2) COOH. Their hydrolysis with a solution of sodium hydroxide in aqueous ethanol, followed by acidification with trifluoroacetic acid, led to the formation of beta-alanyl-L-histidine (L-carnosine).