Synthesis of β -prolinols via [3+2] cycloaddition and one-pot programmed reduction: Valuable building blocks for polyheterocycles
摘要:
A novel two-step synthesis of multisubstituted beta-prolinols has been developed, featuring a [3+2] cycloaddition of azomethine ylides and a programmed reduction triggered by the combination of borane and lithium aluminum hydride (LAH). beta-Prolinols are shown to be valuable building blocks for polyheterocycles. (C) 2016 Elsevier Ltd. All rights reserved.
The Cyano Group as a Traceless Activation Group for the Intermolecular [3+2] Cycloaddition of Azomethine Ylides: A Five-Step Synthesis of (±)-Isoretronecanol
The cyano group was used as a traceless activation group for the [3+2] cycloaddition of azomethine ylides in a two‐step process, thereby providing a highly effective approach to 5‐unsubstituted pyrrolidines. The transformation includes the silver acetate catalyzed intermolecular 1,3‐dipolarcycloaddition of α‐iminonitriles and an unprecedented sodium borohydride induced reductive decyanation reaction
Silver-catalyzed dynamic systemic resolution of α-iminonitriles in a 1,3-dipolar cycloaddition process
作者:Lei Hu、Olof Ramström
DOI:10.1039/c4cc00944d
日期:——
A silver-catalyzed dynamic azomethine ylide system was kinetically resolved in a tandem cycloaddition process, yielding an exclusive pyrrolidine product.
一种银催化的动态偶氮甲基亚胺系统在串联环加成反应中被动力学分辨,产生一种独特的吡咯烷产物。
Bicyclization of Azomethine Ylide: Access to Highly Functionalized 3<i>H</i>-Pyrrolo[2,3-<i>c</i>]quinolines
作者:Yang Men、Jinhuan Dong、Shan Wang、Xianxiu Xu
DOI:10.1021/acs.orglett.7b03434
日期:2017.12.15
was developed for the straightforward and facile synthesis of 2-substituted polyfunctionalized pyrrolo[2,3-c]quinolines. Both an unusual reactivityprofile of azomethine ylide and a novel strategy for the construction of the tricyclic framework by the successive construction of the pyridine and pyrrole rings were exhibited in this domino reaction. Two intermediates are isolated in the control experiments
已开发了亚甲基氨基查耳酮与甲亚胺基亚胺串联双环化反应的方法,可用于简单,方便地合成2-取代的多官能化吡咯并[2,3- c ]喹啉。在该多米诺反应中,既显示出偶氮甲meth叶立德的异常反应谱,又显示了通过连续构建吡啶和吡咯环来构建三环骨架的新策略。在对照实验中分离出两种中间体,因此提出了串联双环化/消除/氧化芳构化的反应机理。
Synthesis of β -prolinols via [3+2] cycloaddition and one-pot programmed reduction: Valuable building blocks for polyheterocycles
作者:Jundong Li、Na Lin、Lei Yu、Yandong Zhang
DOI:10.1016/j.tetlet.2016.11.035
日期:2016.12
A novel two-step synthesis of multisubstituted beta-prolinols has been developed, featuring a [3+2] cycloaddition of azomethine ylides and a programmed reduction triggered by the combination of borane and lithium aluminum hydride (LAH). beta-Prolinols are shown to be valuable building blocks for polyheterocycles. (C) 2016 Elsevier Ltd. All rights reserved.