Synthesis of 3,5-disubstituted-1,2,4-oxadiazoles using tetrabutylammonium fluoride as a mild and efficient catalyst
作者:Anthony R Gangloff、Joane Litvak、Emma J Shelton、David Sperandio、Vivian R Wang、Kenneth D Rice
DOI:10.1016/s0040-4039(00)02288-7
日期:2001.2
Tetrabutylammonium fluoride (TBAF) was found to be a mild and efficient catalyst for the synthesis of 3,5-disubstituted-1,2,4-oxadiazoles. Using 0.1–1.0 equivalents of TBAF in THF for 1–24 h at room temperature, alkanoyl- and aroyloxyamidines were converted in high yield to the corresponding 3,5-disubstituted-1,2,4-oxadiazoles. A variety of R and R′ substituents were investigated.
Construction of 3,5-substituted 1,2,4-oxadiazole rings triggered by tetrabutylammonium hydroxide: a highly efficient and fluoride-free ring closure reaction of O-acylamidoximes
Tetrabutylammonium hydroxide (TBAH) is an efficient and mild alternative to tetrabutylammonium fluoride (TBAF) for base catalyzed cyclizations of 1,2,4-oxadiazoles from O-acylamidoximes. For most 3,5-substituted 1,2,4-oxadiazoles the reactions were dramatically accelerated by addition of 0.1 equiv of TBAH at room temperature. This method was also more generally applicable allowing for a wider range
A novel synthesis of 3,5-disubstituted 1,2,4-oxadiazoles is described from a one-pot, three-component reaction between nitriles, hydroxylamine, and Meldrum's acids undermicrowaveirradiation and solvent-freeconditions in good to excellent yields.
[EN] AZETIDINE AMIDE DERIVATIVES AS OREXIN RECEPTOR ANTAGONISTS<br/>[FR] DÉRIVÉS D'AMIDE D'AZÉTIDINE EN TANT QU'ANTAGONISTES DES RÉCEPTEURS D'ORÉXINE
申请人:ACTELION PHARMACEUTICALS LTD
公开号:WO2014141065A1
公开(公告)日:2014-09-18
The present invention relates to azetidine amide derivatives derivatives of formula (I) wherein rings A1 A2 and A3 are as described in the description, to pharmaceutically acceptable salts thereof, to their preparation, to pharmaceutical compositions containing one or more compounds of formula (I), and to their use as pharmaceuticals, especially to their use as orexin receptor antagonists.
Efficient Synthesis of Functionalized Indene Derivatives via Rh(III)‐Catalyzed Cascade Reaction between Oxadiazoles and Allylic Alcohols
作者:Jing Zhang、Jun‐Shu Sun、Ying‐Qi Xia、Lin Dong
DOI:10.1002/adsc.201801606
日期:2019.4.23
A highly efficient rhodium(III)‐catalyzedsynthesis of novel functionalized indene derivatives has been achieved via C−H activation/intramolecular aldol condensation. This cascade reaction is an atom economical protocol which could be further applied to build more complexcompounds.