Synthesis of 5-aryl-3H-[1,3,4]oxadiazol-2-ones from N′-(chloro-aryl-methylene)-tert-butylcarbazates using basic alumina as an efficient and recyclable surface under solvent-free condition
摘要:
The synthesis of biologically important 5-aryl-3H-[1,3,4]oxadiazol-2-ones has been carried out by heating the easily synthesized N'-(chloro-aryl-methylene)-tert-butylcarbazates on basic alumina surface under solvent-free condition. The dual characteristic of basic alumina as a solid support as well as a nucleophile is successfully exploited in these reactions. The method provides special attributions such as reduced reaction times, easier work-up procedures, and good to excellent yields as well as increased purity of products and most importantly environmentally friendly protocols. The basic alumina is easily recovered and utilized for further reactions several times without serious loss of activity. (C) 2012 Elsevier Ltd. All rights reserved.
The present invention relates to
wherein each symbol is as defined in the specification. The compound has a superior mineralocorticoid receptor antagonistic action and is useful as an agent for the prophylaxis or treatment of a disease or condition mediated by the mineralocorticoid receptor activation.
Facile synthesis of potent HIV-1 protease inhibitors containing a novel pseudo-symmetric dipeptide isostere
作者:Hing L. Sham、David A. Betebenner、Chen Zhao、Norman E. Wideburg、Ayda Saldivar、Dale J. Kempf、Jacob J. Plattner、Daniel W. Norbeck
DOI:10.1039/c39930001052
日期:——
A series of potentinhibitors of the HIV-1proteasecontaining a novel pseudo-symmetric dipeptide isostere 3 was synthesized via ring opening of a protected epoxide with various substituted hydrazines.
A series of pyridazines were prepared and evaluated for their anti-HIV activity. The new synthetic route involving a novel rearrangement reaction provided a practical method for the preparation of 5-hydroxypyridazines. The primary bioassay results indicated that most of the pyridazines possess anti-HIV activity. It ought to been mentioned that the rearranged compounds 35 and 39 exhibited relatively