Synthesis of Novel Substituted Indazoles via Nucleophilic Substitution of Hydrogen (S<i><sub>N</sub></i>H)
作者:Assoman Kouakou、Najat Abbassi、Hakima Chicha、Lahcen El Ammari、Mohamed Saadi、El Mostapha Rakib
DOI:10.1002/hc.21270
日期:2015.9
New four-substituted indazoles 4a–e were synthesized by regioselective nucleophilic substitution of hydrogen of N-alkyl-7-nitroindazoles 2a,b with arylacetonitriles 3a–c. Compounds 4a–e were reacted with arylsulfonyl chloride in pyridine to give some new indazole linked sulfonamides with good yields. The SNH at position C-4 of 7-nitroindazole with arylacetonitrile is confirmed by X-ray diffraction
通过用芳基乙腈 3a-c 对 N-烷基-7-硝基吲唑 2a、b 的氢进行区域选择性亲核取代,合成了新的四取代吲唑 4a-e。化合物 4a-e 与芳基磺酰氯在吡啶中反应得到一些新的吲唑连接的磺酰胺,收率良好。7-硝基吲唑与芳基乙腈在 C-4 位的 SNH 由化合物 4e 和 6a 的 X 射线衍射分析证实。
On the reactions of tertiary carbanions with some nitroindazoles and nitrobenzotriazoles
作者:Marek K. Bernard、Jacek Kujawski、Urszula Skierska、Andrzej K. Gzella、Wojciech Jankowski
DOI:10.3998/ark.5550190.0013.816
日期:——
The vicarious nucleophilic substitution in some nit roindazole and nitrobenzotriazole derivatives with tertiary carbanions leads almost exclusively t o products substituted para to the nitro group. As results from the theoretical calculations and st ructural evidences, such reaction outcome is due mainly to the stereoelectronic reasons in combi nation with the considerable shortening of the Cortho
某些硝基罗吲唑和硝基苯并三唑衍生物中的替代亲核取代与叔碳负离子几乎完全导致产物在硝基的对位被取代。从理论计算和结构证据来看,这种反应结果主要是由于立体电子学的原因和Cortho-CNO 2 键的显着缩短相结合。手性和前手性中心(分别为次甲基和 N 亚甲基基团)的存在通常会引起亚甲基质子信号的额外分裂,该信号在长距离上传输,前提是偶联途径中没有吡啶氮。