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The structural modification of -aryl indazolols as tautomers of -aryl indazolones has been established as a hot topic in pharmaceutics and medicinal chemistry. We herein disclose the rhodium(III)-catalyzed 1,4-addition reaction of maleimides with -aryl indazol-3-ols, which provides the succinimide-bearing indazol-3-ol scaffolds with complete regioselectivity and a good functional group tolerance. Notably, the versatility of this protocol is demonstrated by the use of drug-molecule-linked and fluorescence-probe-linked maleimides.
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http://dx.doi.org/10.1021/acsomega.1c07363 | DOI Listing |
ACS Omega
May 2022
School of Pharmacy, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Jangan-gu, Suwon, Gyeonggi 16419, Republic of Korea.
The structural modification of -aryl indazolols as tautomers of -aryl indazolones has been established as a hot topic in pharmaceutics and medicinal chemistry. We herein disclose the rhodium(III)-catalyzed 1,4-addition reaction of maleimides with -aryl indazol-3-ols, which provides the succinimide-bearing indazol-3-ol scaffolds with complete regioselectivity and a good functional group tolerance. Notably, the versatility of this protocol is demonstrated by the use of drug-molecule-linked and fluorescence-probe-linked maleimides.
View Article and Find Full Text PDFChem Commun (Camb)
October 2011
ImmunoGen, Inc., 830 Winter Street, Waltham, MA, USA.
A novel pathway for ex vivo maytansinoid release from thioether linked antibody maytansinoid conjugates (AMCs) upon incubation in human plasma has been identified. A thioether succinimide-linked AMC can undergo chemical oxidation followed by sulfoxide elimination under mild aqueous conditions (pH 5.5-7.
View Article and Find Full Text PDFCell Mol Life Sci
July 2003
Department of Neurobiology and Behavior, University of California, Irvine, Irvine, California 92697, USA.
Formation of betalinked Asp-Xaa peptide bonds--isoaspartyl (isoAsp) sites--arise in proteins via succinimide-linked deamidation of asparagine or dehydration of aspartate, reactions which represent a major source of spontaneous protein damage under physiological conditions. Accumulation of atypical isoaspartyl sites is minimized in vivo by the activity of protein L-isoaspartyl O-methyltransferase (PIMT), which regenerates a normal peptide bond. Loss of PIMT has harmful consequences, especially in neurons; thus, formation of isoAsp sites and their subsequent correction by PIMT is widely believed to constitute an important pathway of protein damage and repair.
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