使用可持续、原子经济和高效(=短)合成途径发现刚性含氮多杂环的新合成途径在有机化学中具有很高的兴趣。在这里,我们描述了一种操作简单且简短的特权支架二氢吡咯并[1,2 - a ]吡嗪二酮的合成方法,该方法由易于获得的起始材料制成。具有潜在生物活性的生物碱型多环支架是通过基于多组分反应 (MCR) 的方案通过 Ugi 四组分反应和不同条件下的 Pictet-Spengler 序列实现的,产生了多样化的产品库。
The invention relates to a method for producing peptoidic, peptidic and chimeric peptidic-peptoidic dendrimers by multiple iterative multi-component reactions (MCR), in particular Ugi or Passerini multi-component reactions, to compounds produced in this way and to the use thereof.
Scaffolding-Induced Property Modulation of Chemical Space
作者:Jingyao Li、Vincenzo Di Lorenzo、Pravin Patil、Angel J. Ruiz-Moreno、Katarzyna Kurpiewska、Justyna Kalinowska-Tłuścik、Marco A. Velasco-Velázquez、Alexander Dömling
DOI:10.1021/acscombsci.0c00072
日期:2020.7.13
Physicochemical property switching of chemical space is of great importance for optimization of compounds, for example, for biological activity. Cyclization is a key method to control 3D and other properties. A two-step approach, which involves a multicomponent reaction followed by cyclization, is reported to achieve the transition from basic moieties to charge neutral cyclic derivatives. A series
known, the heterocyclic imines 2,5-dihydro-1,3-thiazoles are convertible to bisamides with the aid of a carboxylic acid and an isocyanide (Ugi reaction). Herein, it is shown that 2,5-dihydro-1,3-thiazole S-monoxides-the respective alpha-sulfinyl imines-are characterized by an altered reaction behavior. In a hitherto unknown multicomponent reaction the alpha-sulfinyl imines react with an isocyanide
advantages of our methodology include an increased synthesis speed, very mild conditions giving access to hitherto unknown or highly reactive classes of isocyanides, rapid access to large numbers of functionalized isocyanides, increased yields, high purity, proven scalability over 5 orders of magnitude, increased safety and less reaction waste resulting in a highly reduced environmental footprint. For example
unprecedented heteroannulation process created four chemical bonds in a single operation with the isocyano group acting formally as a polarized double bond and phenyl vinyl selenone as a latent 1,3‐dipole. The phenylselenonyl group played a triple role as an electron‐withdrawing group to activate the 1,4‐addition, a leaving group, and a latent oxidant in this transformation.
在催化量的Cs 2 CO 3存在下,烷基异氰化物,苯基乙烯基硒酮和水的反应得到了恶唑烷-2-酮,收率很高。这种空前的异环化过程在一次操作中产生了四个化学键,异氰基在形式上起极化双键作用,苯基乙烯基硒酮起潜在的1,3-偶极作用。苯基硒壬基在该转化过程中作为吸电子基团发挥了三重作用,以激活1,4加成,一个离去基团和一个潜在的氧化剂。