Efficient synthesis of decahydroacridine-1,8-diones and polyhydroquinolines using the step-wise method
作者:Fatemeh Sadat Hosseininasab、Hamid Reza Memarian
DOI:10.1007/s11164-021-04643-z
日期:2022.4
Various symmetrical and unsymmetrical decahydroacridine-1,8-dione and polyhydroquinoline derivatives were synthesized via two-step cyclocondensation reactions. The advantages of this step-wise addition of reactants in comparison with other one-pot reactions are avoiding the formation of 2 or 3 undesired by-products, therefore allowing cleaner work up of reaction. The important factor of this effective cyclocondensation method is that the prepared β-enaminone component was added dropwise to the solution, in which the Knoevenagel condensation product is slowly being formed by reaction of aldehyde molecule and 1,3-dicarbonyl compounds. The results of the proposed step-wise method are compared and discussed with those obtained in the one-pot reactions.
通过两步环化缩合反应合成了多种对称的和非对称的十氢吖啶-1,8-二酮和多氢喹啉衍生物。与其它一步合成反应相比,逐步加入反应物的优势在于避免形成2或3个不希望的副产品,从而实现了更清洁的反应处理。这种高效环化缩合方法的关键因素是,将制备的β-烯胺酮组分逐滴加入到溶液中,在该溶液中醛分子与1,3-二羰基化合物反应逐渐形成Knoevenagel缩合产物。将提出的逐步方法的结果与一步合成反应所得结果进行比较和讨论。