Revisiting Nucleophilic Substitution Reactions: Microwave-Assisted Synthesis of Azides, Thiocyanates, and Sulfones in an Aqueous Medium
作者:Yuhong Ju、Dalip Kumar、Rajender S. Varma
DOI:10.1021/jo061114h
日期:2006.8.1
practical, rapid, and efficient microwave (MW) promoted synthesis of various azides, thiocyanates, and sulfones is described in an aqueous medium. This general and expeditious MW-enhanced nucleophilicsubstitution approach uses easily accessible starting materials such as halides or tosylates in reaction with alkali azides, thiocyanates, or sulfinates in the absence of any phase-transfer catalyst, and
Studies on the Transformation of Azido-Group to N-(t-Butoxycarbonyl)amino Group<i>via</i>Staudinger Reaction
作者:Carlos A. M. Afonso
DOI:10.1080/00397919808005719
日期:1998.1
tri-n-butylphosphine, followed by addition of di-t-butyl dicarbonate (Boc2O) affords, N-(t-Butoxycarbonyl)amines 2 in moderate to good overall yields. For secondary azides the formation of symmetricaldisubstitutedureas is a competitive process. Conditions were found which, in the presence of a primary amine, allow for moderate selectivity for the reaction with Boc2O.
Reinvestigating Old Pharmacophores: Are 4-Aminoquinolines and Tetraoxanes Potential Two-Stage Antimalarials?
作者:Natasa Terzić、Jelena Konstantinović、Mikloš Tot、Jovana Burojević、Olgica Djurković-Djaković、Jelena Srbljanović、Tijana Štajner、Tatjana Verbić、Mario Zlatović、Marta Machado、Inês S. Albuquerque、Miguel Prudêncio、Richard J. Sciotti、Stevan Pecic、Sarah D’Alessandro、Donatella Taramelli、Bogdan A. Šolaja
DOI:10.1021/acs.jmedchem.5b01374
日期:2016.1.14
The syntheses and antiplasmodial activities of various substituted aminoquinolines coupled to an adamantane carrier are described. The compounds exhibited pronounced in vitro and in vivo activity against Plasmodium berghei in the Thompson test. Tethering a fluorine atom to the aminoquinoline C(3) position afforded fluoroaminoquinolines that act as intrahepatocytic parasite inhibitors, with compound 25 having an IC50 = 0.31 mu M and reducing the liver load in mice by up to 92% at 80 mg/kg dose. Screening our peroxides as inhibitors of liver stage infection revealed that the tetraoxane pharmacophore itself is also an excellent liver stage P. berghei inhibitor (78: IC50 = 0.33 mu M). Up to 91% reduction of the parasite liver load in mice was achieved at 100 mg/kg. Examination of tetraoxane 78 against the transgenic 3D7 strain expressing luciferase under a gametocyte-specific promoter revealed its activity against stage IV-V Plasmodium falciparum gametocytes (IC50 = 1.16 +/- 0.37 mu M). To the best of our knowledge, compounds 25 and 78 are the first examples of either an 4-aminoquinoline or a tetraoxane liver stage inhibitors.