In Situ Generation of Quinolinium Ylides from Diazo Compounds: Copper-Catalyzed Synthesis of Indolizine
作者:Rongxiang Chen、Yanwei Zhao、Hongmei Sun、Ying Shao、Yudong Xu、Meihua Ma、Liang Ma、Xiaobing Wan
DOI:10.1021/acs.joc.7b01042
日期:2017.9.15
The Cu-catalyzedthree-component reaction between quinolines, diazo compounds, and alkenes has been established for direct construction of indolizine derivatives via quinolinium ylides. This methodology is distinguished by the use of a commercially inexpensive catalyst and readily available starting materials, wide substrate scope, and operational simplicity.
Quantification and Theoretical Analysis of the Electrophilicities of Michael Acceptors
作者:Dominik S. Allgäuer、Harish Jangra、Haruyasu Asahara、Zhen Li、Quan Chen、Hendrik Zipse、Armin R. Ofial、Herbert Mayr
DOI:10.1021/jacs.7b05106
日期:2017.9.27
rate-determining step, the nucleophilic attack of 3-5 at the Michael acceptors with formation of acyclic intermediates, which subsequently cyclize to give tetrahydroindolizines (stepwise 1,3-dipolar cycloadditions with 3) and cyclopropanes (with 4 and 5), respectively. The electrophilicity parameters E thus determined can be used to calculate the rates of the reactions of Michael acceptors 1 and 2 with any nucleophile
随后分别环化生成四氢茚茚(与 3 的逐步 1,3-偶极环加成)和环丙烷(与 4 和 5)。由此确定的亲电性参数 E 可用于计算迈克尔受体 1 和 2 与任何已知 N 和 sN 的亲核试剂的反应速率。进行 DFT 计算以确认建议的反应机制并阐明亲电反应性的起源。虽然亲电性 E 与 LUMO 能量和帕尔的亲电性指数 ω 相关性较差,但在实验观察到的 44 个迈克尔受体的亲电反应性与其计算的甲基阴离子亲和力之间发现了良好的相关性,特别是当通过应用考虑二甲基亚砜的溶剂化时SMD 连续溶剂化模型。
Tominaga, Yoshinori; Ichihara, Yuichi; Mori, Tomoko, Journal of Heterocyclic Chemistry, 1990, vol. 27, # 2, p. 263 - 268