Studies on pyrrolidinones. A convenient synthesis of 2-methyl-5-(5-oxo-1-benzyl-2-pyrrolidinyl)-1,3,4-oxadiazole
作者:Benoǐt Rigo、Daniel Couturier
DOI:10.1002/jhet.5570230152
日期:1986.1
2-Methyl-5-(5-oxo-1-benzyl-2-pyrrolidinyl)-1,3,4-oxadiazole is easily obtained by dehydration of N-acetyl-1-benzylpyroglutamic acid hydrazide with a methanesulfonic acid/phosphoric anhydride mixture.
Synthesis of 1,3,4-oxadiazolium and 1,3,4-oxadiazolo[3,2-a]pyridinium salts
作者:G. V. Boyd、S. R. Dando
DOI:10.1039/j39700001397
日期:——
is described. Numerous 3-aryl-1,3,4-oxadiazolium salts, containing a novel type of heterocyclic cation, have been prepared by the action of carboxylic anhydrides on diacylarylhydrazines in the presence of perchloric or fluoroboric acid. 1,3,4-Oxadiazolo[3,2-a]pyridinium salts are similarly formed from 1 -acylamino-2-pyridones. The stability of the salts and their i.r. and n.m.r. spectra are discussed
已经研究了一些简单的1,3,4-恶二唑的质子化和烷基化,并描述了一种新的1,3,4-恶二唑的合成。在高氯酸或氟硼酸的存在下,通过羧酸酐对二酰基芳基肼的作用,已经制备了许多含有新型杂环阳离子的3-芳基-1,3,4-恶二唑鎓盐。类似地由1-酰基氨基-2-吡啶酮形成1,3,4-氧杂二唑[3,2- a ]吡啶鎓盐。讨论了盐的稳定性及其ir和nmr光谱。
A New Synthesis Of 1,3,4-Oxadiazoles. Cyclization Of N.N'-Diacylhydrazeves Catalyzed By Palladium(0)
作者:Stephane Lutun、Bruno Hasiak、Daniel Couturier
DOI:10.1080/00397919908085741
日期:1999.1.1
Abstract Several 1,3,4-oxadiazoles were synthetized by cyclization of N,N'-diacylhydrazines catalyzed by palladium(O). Water formed during the reaction is responsible for the hydrolysis of the products. To avoid it, we introduced benzoic anhydride into the medium and obtained an increased yield of oxadiazoles.
Synthesis of 1,3,4-Oxadiazoles from Carboxylic Hydrazides and of 1,2-Oxazin-6-ones from α-(Hydroxyimino)carboxylic Esters with Keteneylidene Triphenylphosphorane
作者:Jonas Löffler、Rainer Schobert
DOI:10.1055/s-1997-766
日期:1997.3
In a one-pot procedure 1,3,4-oxadiazoles 8 are prepared from carboxylic hydrazides 2 and keteneylidene triphenylphosphorane 1 via an untypical intermolecular Wittig olefination of a carbamate type carbonyl group. Under similar conditions, reaction of 1 and α-(hydroxyimino) carboxylic esters 9 furnishes 1,2-oxazin-6-ones 11 by a different process including an intramolecular olefination step.