Syntheses of heterocyclic compounds. Part XVIII. Aminolysis of 3-aryl-4-bromosydnones, and acid hydrolysis of 3-arylsydnoneimines
作者:G. S. Puranik、H. Suschitzky
DOI:10.1039/j39670001006
日期:——
various 3-aryl- and 3-heteroaryl-4-bromosydnones with piperidine gives the corresponding piperidino-glycyl-piperidines. Fluorine labelling has confirmed the postulated course of fission induced by acids in 3-aryl-sydnoneimines.
The reaction of sydnones with bromine in acetic anhydride revisited: a new route to 5-substituted-3-aryl-1,3,4-oxadiazol-2(3H)-ones from N-aryl-N-bromocarbonylhydrazines
作者:Jonathan Michael Tumey、Thijs Gerritsen、Jimmy Klaasen、Karunakar Reddy Madaram、Kenneth Turnbull
DOI:10.24820/ark.5550190.p010.488
日期:——
The reaction of 3-phenylsydnone with bromine in aceticanhydride to form 5-methyl-3-phenyl-1,3,4-oxadiazol2(3H)-one has been reexamined and improved. A new mechanism involving a bromocarbonylhydrazine species is proposed and its intermediacy is supported by the observation that it reacts with aceticanhydride to yield the corresponding 1,3,4-oxadiazol-2(3H)-one. The process has been expanded to the
A simple and efficient synthesis of novel N,N′-bis (1H-pyrrol-1-yl)-1-[2-(2-aryl-5-methyl-3-oxo-2,4-dihydro-3H-1,2,4-triazol-4-yl)ethyl]-1H-1,2,3-triazole-4,5-dicarboxamides
作者:Prashant R. Latthe、Vinay A. Sunagar、Bharati V. Badami
DOI:10.1002/jhet.5570440620
日期:2007.11
thyl-2,4-dihydro-3H-1,2,4-triazolin-3-ones 2a-g which were converted to the azido compounds 6a-g. These azides on 1,3-dipolar cycloaddition with DMAD afforded the dimethyl-1-[2-(2-aryl-5-methyl-3-oxo-1,2,4-triazol-4-yl)ethyl]-1H-1,2,3-triazol-4,5-dicarboxylates 7a-g which on conversion to bishydrazides 8a-g and further cyclisation with 2,5-hexanedione afforded the title compounds 9a-g. This new short
3-芳基-5-甲基-1,3,4-恶二唑啉-2-酮1a-g与乙醇胺的一锅反应生成4-(2-羟乙基)-2-芳基-5-甲基-2,4 -二氢-3 H -1,2,4-三唑啉-3-酮2a-g,其被转化为叠氮基化合物6a-g。这些叠氮化物与DMAD在1,3-偶极环加成上得到二甲基-1- [2-(2-芳基-5-甲基-3-氧代-1,2,4-三唑-4-基)乙基] -1 H -1,2,3-三唑-4,5-二羧酸酯7a-g,将其转化为二酰肼8a-g,并进一步用2,5-己二酮环化,得到标题化合物9a-g。迄今为止尚不为人知的双-(三唑啉酮-三唑)乙烷的新的短路线涉及温和且收敛的1,3-偶极环加成反应,产生了总体上良好的产物收率。
Kavali, Jyothi R.; Kotresh; Badami, Bharati V., Journal of Chemical Research - Part S, 2003, # 5, p. 275 - 278