In connection with the pericyclic reaction of 3, 5-dimethylpyridine N-oxide with N-substituted maleimides, the structure of a 1, 5-sigmetropy product was determined by the X-ray crystallographic method. In the reaction of 2-alkylpyridine N-oxides with N-substituted maleimides, we have isolated a series of 1 : 3 ene reaction products of a new type.The primary exo cycloadducts readily transform into the endo 1, 5-sigmatropic rearrangement products, which again react with two molecules of N-substituted maleimide to give the 1 : 3 ene reactio products. The observed reaction behavior and plausible reaction pathways are discussed in terms of frontier molecular orbital considerations.
FACILE SYNTHESIS AND HERBICIDAL ACTIVITIES OF NEW ISOXAZOLE DERIVATIVES VIA 1,3-DIPOLAR CYCLO ADDITION REACTION
作者:Chuan-Yu Zhang、Bao-Lei Wang、Xing-Hai Liu、Yong-Hong Li、Su-Hua Wang、Zheng-Ming Li
DOI:10.1515/hc.2008.14.6.397
日期:2008.1
Synthesis and Antifungal Activities of New Pyrazole Derivatives via 1,3-dipolar Cycloaddition Reaction
作者:Chuan-Yu Zhang、Xing-Hai Liu、Bao-Lei Wang、Su-Hua Wang、Zheng-Ming Li
DOI:10.1111/j.1747-0285.2010.00948.x
日期:——
A series of cycloadducts‐‐pyrazoles via 1,3‐dipolarcycloaddition reactions of generated nitrilimines with N‐(4‐chloro‐2‐fluorophenyl)maleimide were described. The novel compounds synthesized were characterized by 1H NMR, MS, and elemental analysis. The fungicidal tests showed that most of the title compounds exhibit significant fungicidal activities against Corynespora cassiicola.
通过生成的腈亚胺与N-(4-氯-2-氟代苯基)马来酰亚胺的1,3-偶极环加成反应描述了一系列环加合物-吡唑。合成的新型化合物通过1 H NMR,MS和元素分析进行表征。杀菌试验表明,大多数标题化合物对棒状杆菌都具有显着的杀菌活性。