Osmium-Catalyzed Vicinal Oxyamination of Alkenes by <i>N</i>-(4-Toluenesulfonyloxy)carbamates
作者:Masruri、Anthony C. Willis、Malcolm D. McLeod
DOI:10.1021/jo301372y
日期:2012.10.5
N-(4-Toluenesulfonyloxy)carbamates based on a range of common amine protecting groups serve as preformed nitrogen sources in the intermolecular osmium-catalyzedoxyamination reaction of a variety of mono-, di-, and trisubstituted alkenes. The reactions occur with low catalyst loadings and good yields and afford high regioselectivity for unsymmetrically substituted alkenes.
Catalyst-Controlled Diastereoselective Synthesis of Cyclic Amines via C-H Functionalization
作者:Sailu Munnuri、Adeniyi Michael Adebesin、Mahesh P Paudyal、Muhammed Yousufuddin、Alfonso Dalipe、John R. Falck
DOI:10.1021/jacs.7b09901
日期:——
restrictions, especially in complex molecule synthesis. This report describes a catalyst-controlled regio- and diastereoselective synthesis of N-unprotected pyrrolidines via dirhodium catalyzed intramolecular nitrene insertion into sp3 C-H bonds. The reaction proceeds at rt without external oxidants, nitrene stabilizing groups, or directing functionality. The insights that emerged from the conforma
A catalyst-free method for the synthesis of 1,4,2-dithiazoles from isothiocyanates and hydroxylamine triflic acid salts
作者:Zhenyu An、Ting Wang、Yafeng Liu、Yi Ren、Rulong Yan
DOI:10.1039/d1ob00938a
日期:——
preparation of 1,4,2-dithiazoles is developed by reactions of isothiocyanates with hydroxylamine triflic acidsalts. This reaction achieves C–S, C–N, and S–N bond formation, and a range of products are obtained in moderate to good yields. The obvious feature is using shelf-stable hydroxylamine triflic acidsalts as a N source to synthesize heterocycles under mild conditions.
通过异硫氰酸酯与羟胺三氟甲磺酸盐的反应,开发了一种制备 1,4,2-二噻唑的无催化剂方法。该反应实现了 C-S、C-N 和 S-N 键的形成,并以中等至良好的产率获得了一系列产物。明显的特点是使用耐储存的羟胺三氟甲磺酸盐作为 N 源在温和条件下合成杂环化合物。
Degradative Rearrangements of <i>N</i>-(<i>t-</i>Butyloxycarbonyl)-<i>O</i>-methanesulfonyl-hydroxamic Acids: A Novel, Reagent-Based Alternative to the Lossen Rearrangement<sup>1</sup>
作者:Jeffrey A. Stafford、Stephen S. Gonzales、David G. Barrett、Edward M. Suh、Paul L. Feldman
DOI:10.1021/jo981498e
日期:1998.12.1
General Synthesis of <i>N</i>-Trifluoromethyl Compounds with <i>N</i>-Trifluoromethyl Hydroxylamine Reagents
preparation of N-CF3 compounds through fluorination and trifluoromethylation of N-containing compounds. The development of new synthetic methods from abundant and easily available substrates is highly desirable but still challenging. Herein, we report the design and synthesis of novel N-Cbz- and N-Boc-N-trifluoromethyl hydroxylamine reagents by silver-mediated oxidative trifluoromethylation. These reagents