Efficient synthesis of primary amides using 2-mercaptopyridone-1-oxide-based uronium salts
摘要:
S-(1-Oxido-2-pyridinyl)-1,1,3,3-tetramethylthiouronium tetrafluoroborate (TOTT) and hexafluorophosphate (HOTT) are cheap and convenient reagents for the rapid and high-yielding preparation of primary amides when reacted with carboxylic acids and ammonium chloride in the presence of diisopropylethylamine. The reaction is chemoselective and undesired ammonolysis of other sensitive functional groups is not observed. (C) 2000 Elsevier Science Ltd. All rights reserved.
Synthesis and Structure−Activity Relationship of Pyrazolo[3,4-<i>d</i>]pyrimidines: Potent and Selective Adenosine A<sub>1</sub> Receptor Antagonists
作者:Sally-Ann Poulsen、Ronald J. Quinn
DOI:10.1021/jm960052s
日期:1996.1.1
structural differences between the A1 and A2a receptors with respect to the binding of pyrazolo[3,4-d]pyrimidines. This study resulted in prediction that increased A1 affinity could be achieved by incorporation of NH-alkyl substituents at C-4. This was confirmed by synthesis of alpha-[[4-(methylamino)-1-phenylpyrazolo[3,4-d]pyrimidin-6-yl]thiol] hexanamide (15) which was found to have an A1 Ki of 0.745 nM
The present invention relates to silica-filled rubber compositions containing dialkyleneamide polysulfides of the formula
where R1 is independently selected from alkylene groups having 1 to 18 carbon atoms and x is an integer of from 2 to 7.