Ammonium acetate as a catalyst and/or reactant in the reaction of dimedone, aromatic aldehyde, and malononitrile: synthesis of tetrahydrobenzo[b]pyrans and hexahydroquinolines
AbstractThe reaction of aromatic aldehydes, dimedone, and malononitrile in the presence of ammonium acetate has afforded tetrahydrobenzo[b]pyrans instead of polyhydroquinolines under both grinding and reflux conditions; thus ammonium acetate acts as a catalyst for this transformation instead of a reactant. Polyhydroquinoline derivatives were also synthesized via a one-pot condensation of aromatic aldehydes
摘要在研磨和回流条件下,芳族醛,二甲酮和丙二腈在乙酸铵存在下的反应得到四氢苯并[ b ]吡喃,而不是聚氢喹啉。因此乙酸铵代替反应物充当该转化的催化剂。聚氢喹啉衍生物还可以通过芳族醛,丙二腈和烯胺酮的一锅缩合反应合成,该缩合反应是由二甲酮和乙酸铵在回流的乙醇中以高收率反应制备的。 图形概要
Synthesis and structural study of novel 1,4,5,6,7,8-hexahydroquinolines
作者:Margarita Suárez、Yamila Verdecia、Estael Ochoa、Nazario Martín、Roberto Martínez、Margarita Quinteir、Carlos Seoane、José L. Soto、Héctor Novoa、Norbert Blaton、Oswald M. Peeters、Camiel De Ranter
DOI:10.1002/jhet.5570370411
日期:2000.7
A new series of 1,4,5,6,7,8-hexahydroquinolines (9a-j) has been synthesized and their structural features studied by X-ray analysis and theoretical calculations at semiempirical and ab initio levels. A good correlation is found between the most stable conformation predicted for compounds 9 and that obtained by experimental X-ray diffraction for 9h. The obtained geometrical features for 9 are similar