Soluble Polymer-Supported Flow Synthesis: A Green Process for the Preparation of Heterocycles
作者:Nicolò Prosa、Raphaël Turgis、Riccardo Piccardi、Marie-Christine Scherrmann
DOI:10.1002/ejoc.201101726
日期:2012.4
3-oxazines were prepared by a four-step synthesis, that is, Baylis–Hillman reaction, Michael addition of amines, cyclization with formaldehyde and hydrolysis of the linkage to PEG. The use of water during the synthesis and most of the purification steps, as well as the benefits of the flow process in terms of improved safety and heat transfer agree with the principles of green chemistry.
首次研究了 PEG 支持的水流合成与作为分离技术的超滤相结合。作为案例研究,该策略被应用于从相同的 PEG 连接醛制备新的 3,4-二氢嘧啶-2(1H)-酮、四唑和四氢-1,3-恶嗪。二氢嘧啶酮是通过铜 (II) 催化的 Biginelli 反应制备的,而通过 Baylis-Hillman 反应随后进行还原和 1,3-偶极环加成反应获得了一种新的含四唑化合物。最后,通过四步合成法制备了各种新的四氢-1,3-恶嗪,即 Baylis-Hillman 反应、胺的迈克尔加成、甲醛环化和与 PEG 的键合水解。在合成和大部分纯化步骤中使用水,