Preparation of different amides via Ritter reaction from alcohols and nitriles in the presence of silica-bonded N- propyl sulphamic acid (SBNPSA) under solvent-free conditions
of methods have been proposed for the modification of the Ritterreaction. However, many of these methods involve the use of strongly acidic conditions, stoichiometric amounts of reagents, harsh reactionconditions and extended reaction times. Therefore, the development of mild, efficient, convenient and benign reagents for the Ritterreaction is desirable. In this research, we have developed a clean
Magnetic CoFe2O4 nanoparticle immobilized N-propyl diethylenetriamine sulfamic acid as an efficient and recyclable catalyst for the synthesis of amides via the Ritter reaction
A magneticCoFe2O4nanoparticle immobilized diamine-N-sulfamic acid (CoFe2O4@SiO2–DASA) was synthesized and used as efficient heterogeneous catalyst for the synthesis of amides via the Ritter reaction under solvent-free conditions. The magnetic nanocatalyst could be readily recovered by applying an external magnet and recycled several times without considerable loss of its catalytic activity.
合成了磁性CoFe 2 O 4纳米颗粒固定化的二胺-N-氨基磺酸(CoFe 2 O 4 @SiO 2 -DASA),并用作无溶剂条件下通过Ritter反应合成酰胺的有效多相催化剂。通过施加外部磁体可以容易地回收磁性纳米催化剂,并循环几次,而不会显着降低其催化活性。
[EN] CYCLIC SUBSTITUTED-1,3,4-OXADIAZOLE AND THIADIAZOLE COMPOUNDS AS IMMUNOMODULATORS<br/>[FR] COMPOSÉS CYCLIQUES SUBSTITUÉS DE 1,3,4-OXADIAZOLE ET THIADIAZOLE UTILISÉS EN TANT QU'IMMUNOMODULATEURS
申请人:AURIGENE DISCOVERY TECH LTD
公开号:WO2018051255A1
公开(公告)日:2018-03-22
The present invention relates to cyclic substituted 1,3,4-oxadiazole and thiadiazole compounds of formula (I) and their use to inhibit the programmed cell death 1 (PD1) signaling pathway and/or for treatment of disorders by inhibiting an immunosuppressive signal induced by PD-1, PD-L1 or PD-L2.
An efficient solvent-free synthesis of amides by Ca(II) catalyzed Ritterreaction has been reported under microwave irradiation. This green protocol tolerates the substrate diversity and delivers the high yielding amides with minimal loading of inexpensive and more abundant Ca(II) catalyst.
Zinc chloride homogeneous catalysis in the tritylation of hydroxyl- and amide-bearing molecules
作者:Maurizio Maltese、Maria Cecilia Vergari、Maria Pia Donzello
DOI:10.1016/j.tetlet.2010.11.095
日期:2011.1
A tritylation protocol based on the transfer of the triphenylmethylcarbenium ion from trityl acetate to substrates having hydroxyls, in the presence of catalytic amounts of ZnCl2, is described. The advantages of this method are broad scope, mild conditions, and easy handling. The comparison with the procedure based on the use of equimolar mixture of TrCl and ZnCl2 in the presence of TEA shows that