Efficient synthesis of N-protected amino/peptide Weinreb amides from T3P and DBU
作者:K.M. Sharnabai、G. Nagendra、T.M. Vishwanatha、Vommina V. Sureshbabu
DOI:10.1016/j.tetlet.2012.11.064
日期:2013.2
The reaction of N-alpha-protected amino/peptide acid with N,O-dimethylhydroxylamine hydrochloride in the presence of T3P and DBU to obtain enantiomerically pure N-alpha-protected amino/peptidyl Weinreb amides in high yields has been described. Fmoc-Ala-Weinreb amide 2a is obtained as single crystal, and its structure was determined through X-ray crystallography. (C) 2012 Elsevier Ltd. All rights reserved.
Esterase-Sensitive Prodrugs of a Potent Bisubstrate Inhibitor of Nicotinamide N-Methyltransferase (NNMT) Display Cellular Activity
作者:Matthijs J. van Haren、Yongzhi Gao、Ned Buijs、Roberto Campagna、Davide Sartini、Monica Emanuelli、Lukasz Mateuszuk、Agnieszka Kij、Stefan Chlopicki、Pol Escudé Martinez de Castilla、Raymond Schiffelers、Nathaniel I. Martin
DOI:10.3390/biom11091357
日期:——
a range of esters in the absence or presence of a trimethyl-lock (TML) amine protecting group yielded a range of candidate prodrugs. Based on the stability in an aqueous buffer, and the confirmed esterase-dependent conversion to the parentcompound, the isopropyl ester was selected as the preferred acid prodrug. The isopropyl ester and isopropyl ester-TML prodrugs exhibit improved cell permeability