1,3-Dipolarcycloaddition of 2-arylidene-6,7-dihydro-5H-thiazolo[3,2-a]pyrimidine-3(5H)-ones to diphenylnitrilimine (generated in situ by triethylamine dehydrohalogenation of the N′-phenylbenzohydrazonoyl chloride) proceeded regio- and site-selectively affording a mixture of two unexpected isomer products at reflux temperature. The cycloaddition/ring-opening/rearrangement/substitution, mechanism of
2-芳基-6,7-二氢-5 H-噻唑并[3,2- a ]嘧啶-3(5 H)-ones的1,3-偶极环加成反应成二苯基硝胺(通过N '的三乙胺脱卤作用原位生成) -苯基苯并偶氮酰氯)在回流温度下进行区域和位点选择性反应,得到两种意想不到的异构体产物的混合物。还讨论了环加成/开环/重排/取代反应的机理。
Synthesis of spiro thiazolo[3,2-a]pyrimidine compounds by one-pot sequential 1,3-dipolar cycloadditions
作者:Xiaofang Li、Aiting Zheng、Bin Liu、Guobin Li、Xianyong Yu、Pinggui Yi
DOI:10.1002/jhet.578
日期:2011.7
A new class of spirothiazolo[3,2‐a]pyrimidinecompounds were synthesized by the one‐pot sequential 1,3‐dipolar cycloaddition of azomethine ylide (generated from isatin and sarcosine)–nitrile oxide to 2‐arylmethylidene‐6,7‐dihydro‐5H‐thiazolo[3,2‐a]pyrimidin‐3‐ones in moderate yields. The structures of all the products were characterized thoroughly by NMR, MS, IR, elemental analysis, and NMR together
通过一锅顺序的1,3-偶极环加成甲亚胺(由伊斯丁和肌氨酸生成)-一氧化氮-二氧化氮合成2-芳基亚甲基-6,7,合成了新型螺噻唑[3,2- a ]嘧啶化合物-dihydro-5 H - thiazolo [3,2- a ]嘧啶-3-中等产量。通过NMR,MS,IR,元素分析,NMR和X射线晶体学分析对所有产品的结构进行了全面表征。J.杂环化学。(2011)。