羰基构成了几种药物分子和材料的组成部分;因此,羰基化化合物的合成对于合成化学家和药物化学家来说仍然是一个有趣的研究领域。处理有毒 CO 气体有几个局限性;因此,使用安全有效的技术进行原位或非原位从无毒且廉价的前体中产生一氧化碳是非常可取的。在已探索用于产生 CO 气体的几种前体中,氯仿由于其成本效益高且易于获得,可证明是一种有前途的 CO 替代品。然而,基于氯仿的一锅式羰基化反应需要强碱性条件才能水解氯仿,这可能会影响底物的官能团耐受性和放大反应。这些限制可以通过可用于非原位的两室反应器 (COware) 来克服在一个室中通过氯仿水解产生 CO,并在温和条件下在另一个室中促进安全的羰基化反应。通过钯催化的医学相关杂环核心(即异喹啉和喹啉)的氨基羰基化,探索了这种“氯仿-COware”技术的多功能性。
N-Aryl and N-alkenyl carbamoyl benzotriazoles were prepared in good to excellent yields from acyl azides and benzotri-azole via Curtiusrearrangement, while N-alkylcarbamoyl benzotriazoles were formed from N-alkanoyl benzotriazoles and sodium azide in one pot. The carbamoyl benzotriazoles can be used as a stable isocyanate alternative, as has been demonstrated by its reaction with amines to synthesize
Direct and facile synthesis of acyl azides from carboxylic acids using the trichloroisocyanuric acid–triphenylphosphine system
作者:Batool Akhlaghinia、Hamed Rouhi-Saadabad
DOI:10.1139/cjc-2011-0493
日期:2013.3
A mild, efficient, and practical method for the one-step synthesis of acyl azides from carboxylic acids using a safe and inexpensive mixed reagent, trichloroisocyanuric acid–triphenylphosphine, is described.
[image omitted] Catalyzed by ferric chloride hexahydrate (FeCl3 center dot 6H2O), the acylation of sodium azide with N-acylbenzotriazoles was greatly accelerated in a mixed solvent of acetone and water. Thus, good to excellent yields of a variety of acyl azides were obtained at room temperature in a short time. Furthermore, because of the complete conversion of N-acylbenzotriazoles and the easy removal of the by-product, purification by column chromatography was no longer required, which made the protocol suitable for large-scale preparation.