Acetic acid-promoted eco-friendly one-pot pseudo six-component synthesis of bis-spiro-substituted piperidines
作者:Mir Rasul Mousavi、Hadigheh Gharari、Malek Taher Maghsoodlou、Nourallah Hazeri
DOI:10.1007/s11164-015-2250-8
日期:2016.4
A simple, economical, and environmentally benign protocol has been described for one-pot synthesis of 15-(aryl)-3,3,11,11-tetramethyl-15-azadispiro[5.1.5.3]hexadecane-1,5,9,13-tetrone by pseudo six-component condensation between formaldehyde, dimedone, and aromatic amine using the dual role of acetic acid as solvent and catalyst at room temperature. Ambient conditions and avoidance of conventional work-up as well as purification procedure qualify this economical and cost-effective protocol for “green synthesis”. High efficiency, inexpensiveness, and non-toxicity are the interesting features of this methodology, which make it eco-friendly and highly attractive. One of the important and interesting advantages of this methodology compared to previous methods is that electron-withdrawing substituent anilines also give the desired product which was not possible using the methodologies of Kozlov and Mukhopadhyay.
本研究采用乙酸作为溶剂和催化剂,在室温下通过甲醛、二甲基酮和芳香胺之间的伪六组份缩合反应,描述了一种简单、经济、环保的单锅合成 15-(芳基)-3,3,11,11-四甲基-15-氮杂二螺[5.1.5.3]十六烷-1,5,9,13-四酮的方法。这种 "绿色合成 "方法在常温条件下进行,避免了传统的加工和纯化过程,经济实惠。高效、低毒和无毒是这种方法的有趣特点,这些特点使其成为生态友好和极具吸引力的方法。与以前的方法相比,这种方法的一个重要而有趣的优点是,抽电子取代基苯胺也能得到所需的产物,而使用 Kozlov 和 Mukhopadhyay 的方法则无法得到这种产物。