共查询到18条相似文献,搜索用时 161 毫秒
1.
2.
3.
本文对[4+ 3 ]环加成反应体系以及最近在合成中的应用进行了综述, 并对进一步研究的方向进行了讨论。 相似文献
4.
5.
6.
7.
8.
9.
10.
11.
综述了亚甲胺叶立德的制备、它参与的[3+2]环加成反应的反应机理、反应选择性及在天然产物全合成中的应用等方面的最新进展. 相似文献
12.
Hexafluoroantimonic Acid Catalysis: Formal [3+2+2] Cycloaddition of Aziridines with Two Alkynes 下载免费PDF全文
Ming‐Bo Zhou Ren‐Jie Song Prof. Dr. Jin‐Heng Li 《Angewandte Chemie (International ed. in English)》2014,53(16):4196-4199
A practical method for the synthesis of azepine derivatives, a typical seven‐membered heterocyclic ring system, was developed and involves the use of hexafluoroantimonic acid to catalyze a formal [3+2+2] cycloaddition of aziridines with two alkynes. This method was applicable to two of the same or different terminal alkynes for the [3+2+2] cycloaddition with unactivated aziridines, and furnished the corresponding azepine derivatives in good yields with good levels of chemo‐ and regioselectivity. The mechanism was also discussed according to the results of the in situ HRMS and 1H NMR analysis. 相似文献
13.
14.
Oxidative dehydrogenative [3+3] annulation of benzylhydrazines with N‐sulfonylaziridines is described. A series of complex tetrahydro‐1,2,4‐triazines were produced under mild reaction conditions. 相似文献
15.
The rhodium(II) acetate catalysed decomposition of diethyl 4-diazopent-2-enedioate in the presence of furans results in the formation of products derived from a [3 + 4] cycloaddition. 相似文献
16.
Dr. Dong‐Chao Wang Dr. Ming‐Sheng Xie Prof. Dr. Hai‐Ming Guo Prof. Gui‐Rong Qu Meng‐Cheng Zhang Prof. Dr. Shu‐Li You 《Angewandte Chemie (International ed. in English)》2016,55(45):14111-14115
A highly enantioselective dearomative [3+2] cycloaddition of benzothiazole has been successfully developed. A wide range of benzothiazoles and cyclopropane‐1,1‐dicarboxylates are suitable substrates for this reaction. The desired hydropyrrolo[2,1‐b]thiazole compounds were obtained in excellent enantioselectivity and yields (up to 97 % ee and 97 % yield). With the same catalytic system, a highly efficient kinetic resolution of 2‐substituted cyclopropane‐1,1‐dicarboxylates was also realized. 相似文献
17.
18.