Highly Substituted 2,3-Dihydroisoxazoles by Et<sub>3</sub>N-Catalyzed Tandem Reaction of Electron-Deficient 1,3-Conjugated Enynes with Hydroxylamines
作者:Xiuzhao Yu、Bo Du、Kai Wang、Junliang Zhang
DOI:10.1021/ol100490y
日期:2010.4.16
reaction of electron-deficient 1,3-conjugated enynes with hydroxylamines was developed which provided rapid, metal-free, and regioselective access to highly substituted multifunctionalized 2,3-dihydroisoxazoles under mild conditions. The reactions of 3-(2-arylethynyl)-4H-chromen-4-ones with hydroxylamines afford β-amino enones under the same reaction conditions.
(β-<scp>D</scp>-Ribofuranosyl)formamidine in the Design and Synthesis of 2-(β-<scp>D</scp>-Ribofuranosyl)pyrimidines, Including R<sup>F</sup>-Containing Derivatives
作者:Viktor O. Iaroshenko、Sergii Dudkin、Vyacheslav Ya. Sosnovskikh、Alexander Villinger、Peter Langer
DOI:10.1002/ejoc.201300107
日期:2013.5
A wide range of novel 2-(β-D-ribofuranosyl)pyrimidines, including RF-containing derivatives, have been synthesized by the reaction of (β-D-ribofuranosyl)formamidine with various dielectrophilic substrates such as 3-alkoxy- and 3-chloro-1-(polyfluoroalkyl)propen-1-ones, 3-nitro- and 3-(phenylethynyl)chromones and heteroaryl acetylenic ketones.
CuCl2-catalyzed N O bond cleavage of oxime esters: Approach to imidazoheterocycles and furo[3,2-c]chromenyl fused imidazoles
作者:Santosh K. Gudimella、Amanpreet Kaur、Ram Kumar、Sampak Samanta
DOI:10.1016/j.tetlet.2020.152147
日期:2020.7
An articulate approach to a diverse set of imidazoheterocycles in good to high yields via a copper-catalyzed aza-annulation of several oxime esters with a group of 2-amino-azaarenes was developed. The above cyclization reaction probably proceeds via a single electron transfer process which embodies a new technique for creating two new CN bonds for imidazole ring synthesis. Gratifyingly, the implementation
通过用几种肟酯与一组2-氨基氮杂氮杂铜进行铜催化的氮杂环化反应,开发了一种以良好至高收率的多种咪唑杂环杂环的铰接方法。上述环化反应可能是通过单电子转移过程进行的,这体现了一种新技术,该技术为咪唑环合成生成两个新的C N键。令人欣慰的是,该化学方法的实施可以进一步扩展为通过连续的C N键形成,合成带有呋喃[3,2- c ]亚甲基部分的新型稠合咪唑,随后是C(sp 2)-H功能化/ 5-内切-乙氧基环化(CC和C在铜(II)作为π亲电Lewis酸催化剂的情况下,原位生成带有环状烯酮的稠合咪唑。
Cu(I) Catalyst in DMF: An Efficient Catalytic System for the Synthesis of Furans from 2-(1-Alkynyl)-2-alken-1-ones
作者:Nitin T. Patil、Huanyou Wu、Yoshinori Yamamoto
DOI:10.1021/jo050191u
日期:2005.5.1
The cyclization of 2-(1-alkynyl)-2-alken-1-ones 1 proceeded very smoothly in the presence of alcohols 2 with a catalytic amount of Cu(I)Br in DMF at 80 °C, leading to the formation of highlysubstitutedfurans 3. The catalytic system reported herein is easy to handle, compared to the previously known system wherein the reaction between 1 and 2 needed to use moisture sensitive gold(III) chloride.
AuCl<sub>3</sub>-Catalyzed Synthesis of Highly Substituted Furans from 2-(1-Alkynyl)-2-alken-1-ones
作者:Tuanli Yao、Xiaoxia Zhang、Richard C. Larock
DOI:10.1021/ja0466964
日期:2004.9.1
Highly substituted furans have been synthesized by the reaction of 2-(1-alkynyl)-2-alken-1-ones and various nucleophiles under very mild reaction conditions in good to excellent yields. Gold and some other transition metals are efficient catalysts for this reaction.