Nicotinoyl Azide (NCA)-Mediated Mitsunobu Reaction: An Expedient One-Pot Transformation of Alcohols into Azides
作者:Gianluca Papeo、Helena Posteri、Paola Vianello、Mario Varasi
DOI:10.1055/s-2004-831254
日期:——
A practical and simple method that allows preparation of azides from alcohols is described. The process involves oxyphosphonium-type activation and it is based upon the use of nicotinoyl azide (NCA), a cheap and easily accessible azide ion source.
Ï-Allylic azidation of allyl esters was performed with an amphiphilic polystyrene-poly(ethylene glycol) (PS-PEG) resin-supported phosphine-palladium complex in water under heterogeneous conditions to give allyl azides in good to high yields. The polymeric palladium catalyst can be readily recovered and recycled.
Palladium catalyzed reaction of allyl acetates with azide ion gives allylazides, which are readily converted into the corresponding primaryallylamines upon treatment with PPh3/NaOH.
Exploring the chemical space of 1,2,3-triazolyl triclosan analogs for discovery of new antileishmanial chemotherapeutic agents
作者:Julia Fernández de Luco、Alejandro I. Recio-Balsells、Diego G. Ghiano、Ana Bortolotti、Juán Manuel Belardinelli、Nina Liu、Pascal Hoffmann、Christian Lherbet、Peter J. Tonge、Babu Tekwani、Héctor R. Morbidoni、Guillermo R. Labadie
DOI:10.1039/d0md00291g
日期:——
were designed in search of novel structures with leishmanicidal activity and prepared using different alkynes and azides. The 37 compounds were assayed against Leishmania donovani, the etiological agent of leishmaniasis, yielding some analogs with activity at micromolar concentrations and against M. tuberculosis H37Rv resulting in scarce active compounds with an MIC of 20 μM. To study the mechanism