Tertiary Amine-Triggered Cascade S<sub>N</sub>2/Cycloaddition: An Efficient Construction of Complex Azaheterocycles under Mild Conditions
作者:Jian Hu、Bing Tian、Xinyan Wu、Xiaofeng Tong
DOI:10.1021/ol302329b
日期:2012.10.5
In this paper, an amine-triggeredcascade SN2/cycloaddtion sequence between 2-(acetoxymethyl)buta-2,3-dienoate 1 and various π-system functionalized tosylamides 3 has been reported, which provides a facile method for stereoselective construction of structurally diverse azaheterocycles.
在本文中,已经报道了在2-(乙酰氧基甲基)丁2,3-二烯酸酯1和各种π-系统官能化的甲苯磺酰胺3之间的胺触发级联S N 2 /环加成序列,为立体选择性构建Sn 2提供了一种简便的方法。结构上不同的氮杂杂环。
De Novo Construction of Substituted Terephthalates via Phosphine Catalyzed Domino Benzannulation Reactions
作者:Dan Wang、Junhui Lin、Yannan Zhu、You Huang
DOI:10.1002/adsc.202001513
日期:2021.3.29
The robustness of phosphine catalysis enabling the domino benzannulationreactions of allenoates with enamines is described. A broad array of substituted terephthalates were delivered under simple and practical reaction conditions. Furthermore, the reaction could be carried out on a gram scale with higher yield, and various conversions of the terephthalate products demonstrate the versatility of this
Asymmetric Synthesis of Spiropyrazolones through Phosphine-Catalyzed [4+1] Annulation
作者:Xiaoyu Han、Weijun Yao、Tianli Wang、Yong Ren Tan、Ziyu Yan、Jacek Kwiatkowski、Yixin Lu
DOI:10.1002/anie.201311214
日期:2014.5.26
enantioselective synthesis of spiropyrazolones from allenoate‐derived MBH acetates and pyrazolones through a phosphine‐mediated [4+1] annulation process has been developed. Spiropyrazolones were readily prepared in good chemical yields and good to high enantioselectivities. This is the first asymmetric example in which α‐substituted allenoates were utilized as a C4 synthon for phosphine‐catalyzed [4+1] annulation
Amine-Promoted Asymmetric (4+2) Annulations for the Enantioselective Synthesis of Tetrahydropyridines: A Traceless and Recoverable Auxiliary Strategy
作者:Pengfei Hu、Jian Hu、Jiajun Jiao、Xiaofeng Tong
DOI:10.1002/anie.201300526
日期:2013.5.10
without a trace: The in situ reaction of 2‐(acetoxymethyl)buta‐2,3‐dienoate and a secondary amine produces a 2‐methylene‐3‐oxobutanoate equivalent that can be used in asymmetric [4+2] annulations with N‐tosylimines to provide tetrahydropyridines in good to excellent yields and enantioselectivities. The amine is easily recovered and acts as a tracelessauxiliary.
Dielectrophilic Allenic Ketone-Enabled [4 + 2] Annulation with 3,3’-Bisoxindoles: Enantioselective Creation of Two Contiguous Quaternary Stereogenic Centers
作者:Xiaodong Tang、Chuan Xiang Alvin Tan、Wai-Lun Chan、Fuhao Zhang、Wenrui Zheng、Yixin Lu
DOI:10.1021/acscatal.0c05225
日期:2021.2.5
intermediates created upon phosphine activation empowered the utilization of 3,3′-bis-oxindoles as a two-carbon reaction partner in a highlyenantioselective [4 + 2] annulation, allowing for facile creation of spirocyclic bisindoline structures containing twocontiguousquaternary stereogenic centers. Synthetic manipulations of the [4 + 2] annulation product led to concise total synthesis of (−)-folicanthine