One-pot preparation of isocyanides from amines and their multicomponent reactions: crucial role of dehydrating agent and base
作者:Sankar K. Guchhait、Garima Priyadarshani、Vikas Chaudhary、Darshan R. Seladiya、Tapan M. Shah、Nikita P. Bhogayta
DOI:10.1039/c3ra40347e
日期:——
A novel one-pot practical approach for the preparation of isocyanide directly from amine and its reaction has been developed. It employs formylation of amine, dehydration of formamide to isocyanide, and its multicomponent reactions (Ugi, Passerini, and Groebke–Blackburn–Bienaymé reactions). This method provides a significant solution to known synthetic difficulties of isocyanides. In this approach
Microwave‐assisted
<scp>Groebke‐Blackburn‐Bienaymé</scp>
multicomponent reaction to synthesize imidazo fused heterocycles via in‐situ generated isocyanides from
<i>N</i>
‐formylamines: An undergraduate organic laboratory experiment
作者:Manpreet Kaur、Rahul Singh、Madhuri T. Patil、Kushvinder Kumar、Subash Chandra Sahoo、Kamal Nain Singh、Vinod D. Chaudhari、Deepak B. Salunke
DOI:10.1002/jhet.4386
日期:2022.2
a separate step for the synthesis of isocyanides having disagreeable odor. Fourteen different GBB based heterocycles have been synthesized to demonstrate the feasibility of the optimized protocol. The preparation of N-formylamines utilized in the synthesis is also elaborated and the overall process was optimized to be suitable for a typical undergraduate organic laboratory experiment. One of the final
开发了一种使用 I 2 -PPh 3 -Et 3 N 试剂将N-甲胺、2-氨基吡啶和醛直接转化为 2,3-取代的咪唑并[1,2- a ]吡啶杂环的一锅法微波辐射下的系统。在反应过程中,I 2 -PPh 3 -Et 3 N 将N甲胺生成异氰化物,在原位生成的碘化氢 (HI) 存在下,与醛和 2-氨基吡啶发生 Groebke-Balckburn-Bienaymé (GBB) 多组分反应。原位产生的 HI 消除了 GBB 反应对外部催化剂的需求。所开发的方法结合了使用容易获得且廉价的试剂,并且还避免了用于合成具有难闻气味的异氰化物的单独步骤。已经合成了 14 种不同的基于 GBB 的杂环,以证明优化方案的可行性。N的制备还详细阐述了合成中使用的-甲胺,并优化了整个过程以适用于典型的本科有机实验室实验。使用 FT-IR、 1 H NMR、13 C NMR、DEPT、COSY、HSQC、HRMS 和单晶