Solvent-free Michael addition of 2-cyclohexenone under ultrasonic irradiation in the presence of long chain dicationic ammonium salts
作者:AYTEK ÖGE、MURAT EMRAH MAVİŞ、ÇİĞDEM YOLAÇAN、FERAY AYDOĞAN
DOI:10.3906/kim-1104-63
日期:——
Long chain dicationic ammonium salts (1a-1c), easily prepared from tert-amines and dihaloalkanes, were successfully used as efficient phase-transfer catalysts in the Michael addition reaction of various active methylene compounds to 2-cyclohexenone without solvent under ultrasonic irradiation. The investigated dicationic salts were more effective than monocationic tetrabutylammonium bromide, with short reaction times and high yields. This methodology was established under phase-transfer catalytic conditions and ultrasonic effects with many advantages, including the easy and cost-effective synthesis of the catalyst, mild reaction conditions, short reaction times, good yields, simple work-up procedures, and environmental friendliness.
长链双阳离子季铵盐(1a-1c),通过叔胺和二卤代烷的简易制备,成功地作为高效相转移催化剂应用于超声辐射下无溶剂的各类活性亚甲基化合物与2-环己烯酮的迈克尔加成反应中。研究的双阳离子盐比单阳离子四丁基溴化铵更为有效,具有短反应时间和高产率的特点。该方法在相转移催化条件和超声效应下建立,具有许多优点,包括催化剂的简易和成本效益高的合成、温和的反应条件、短反应时间、良好的产率、简化的后处理过程以及环境友好性。