cascade reaction of azides with isonitrile and amines is presented; it offers an alternative facile approach toward N-sulfonyl-, N-phosphoryl-, and N-acyl-functionalized guanidines in excellent yield. These series of substituted guanidines exhibit potential biological and pharmacological activities. In addition, the less reactive intermediate benzoyl carbodiimide could be isolated by silica gel column flash
Deoxygenative Amination of Azine-<i>N</i>-oxides with Acyl Azides via [3 + 2] Cycloaddition
作者:Dongeun Kim、Prithwish Ghosh、Na Yeon Kwon、Sang Hoon Han、Sangil Han、Neeraj Kumar Mishra、Saegun Kim、In Su Kim
DOI:10.1021/acs.joc.9b03173
日期:2020.2.21
an isocyanate from the starting acyl azide via a Curtius rearrangement can trigger a [3 + 2] dipolar cycloaddition of polar N-oxide fragments to generate the aminated azine derivative. The applicability of this method is highlighted by the late-stage and sequential amination reactions of complex bioactive compounds, including quinidine and fasudil. Moreover, the direct transformation of aminated azines
Synthesis of <i>N</i>-methylated amines from acyl azides using methanol
作者:Kaushik Chakrabarti、Kuheli Dutta、Sabuj Kundu
DOI:10.1039/d0ob01303j
日期:——
derivatives into N-methylamines was developed using methanol as the C1 source via the one-pot Curtius rearrangement and borrowing hydrogen methodology. Following this protocol, various functionalised N-methylated amines were synthesized using the (NNN)Ru(II) complex from carboxylic acids via an acyl azide intermediate. Several kinetic studies and DFT calculations were carried out to support the mechanism
使用甲醇作为 C1 源,通过一锅 Curtius 重排和借氢方法,将酰基叠氮化物衍生物转化为N-甲胺。按照该协议,使用 (NNN)Ru( II ) 配合物从羧酸通过酰基叠氮化物中间体合成各种功能化的N-甲基化胺。进行了几项动力学研究和 DFT 计算以支持该机制,并确定 Ru( II ) 配合物和碱在这种转变中的作用。
The Challenge of Palladium-Catalyzed Aromatic Azidocarbonylation: From Mechanistic and Catalyst Deactivation Studies to a Highly Efficient Process
作者:Fedor M. Miloserdov、Claire L. McMullin、Marta Martı́nez Belmonte、Jordi Benet-Buchholz、Vladimir I. Bakhmutov、Stuart A. Macgregor、Vladimir V. Grushin
DOI:10.1021/om401126m
日期:2014.2.10
Azidocarbonylation of iodoarenes with CO and NaN3, a novel Heck-type carbonylation reaction, readily occurs in an organic solvent–H2O biphasic system to furnish aroyl azides at room temperature and 1 atm. The reaction is catalyzed by Xantphos-Pd and exhibits high functional group tolerance. The catalyst deactivation product, [(Xantphos)PdI2], can be reduced in situ with PMHS to Pd(0) to regain catalytic
Aryl iodides smoothly react with NaN3 and CO in the presence of a Pd/Xantphos catalyst to give aroyl azides (ArCON3) in 75–92 % yield. The reaction occurs under mild reaction conditions (1 atm, 20–50 °C) and exhibits high functional‐group tolerance. (Xantphos=9,9‐dimethyl‐4,5‐bis(diphenylphosphino)xanthene)