Synthesis of Novel Spiro Pyrrolidine and Pyrrolizine Derivatives by 1,3-Dipolar Cycloaddition
作者:Xiaofang Li、Aiting Zheng、Bin Liu、Xianyong Yu、Pinggui Yi
DOI:10.1002/cjoc.201090209
日期:——
The 1,3‐dipolar cycloaddition of azomethine ylides derived from isatin and amino acids viz. sarcosine and proline to 2‐arylmethylidene‐5,6‐dihydroimidazo[2,1‐b]thiazol‐3(2H)‐ones afforded novelspiropyrrolidines and pyrrolizidines regio‐ and stereoselectively in moderate yields. The products were characterized thoroughly by IR, MS, NMR together with elementary analysis.
甲亚胺叶立德的1,3-偶极环加成从靛红和氨基酸衍生即。肌氨酸和脯氨酸生成2-芳基亚甲基-5,6-二氢咪唑并[2,1- b ]噻唑-3(2 H)-酮可适度地选择性和立体选择性地提供新型螺吡咯烷和吡咯烷核苷。通过IR,MS,NMR以及元素分析对产物进行了彻底的表征。
Synthesis and Characterization of Some New Imidazo [2,1-a] Pyrazolo [3,4-d] Thiazoles as Potentials Fungicide
作者:ATMA RAM MISHRA、VIVEK SRIVASTAVA、ABU SHAHMA
DOI:10.13005/ojc/280349
日期:2012.9.18
The new cis-3,3a-imidazo(2,1-a)-pyrazolo(3,4-d) thiazoles (IIa-l) have been synthesized by refluxing a mixture of 2-(p-ethoxy arylidene-5,6-dehydro imidazo (2,1-a)-thiazolidene-3-one(IIa- f) with hydrazine hydrate or 2,4-di-nitro phenyl hydrazine and anhydrous sodiumacetate in glacial acetatic acid. All the synthesized compounds have been characterized by elemental analysis & spectral data and also