Mechanistic and Exploratory Investigations into the Synthesis of 1,3,5-Triaroylbenzenes from 1-Aryl-2-propyn-1-ones and 1,3,5-Triacetylbenzene from 4-Methoxy-3-buten-2-one by Cyclotrimerization in Hot Water in the Absence of Added Acid or Base
作者:Tatsuya Iwado、Keiya Hasegawa、Toshiyuki Sato、Masaki Okada、Kiwamu Sue、Hiizu Iwamura、Toshihiko Hiaki
DOI:10.1021/jo301979p
日期:2013.3.1
intermediate for the formation of 2, 2′ and the acetophenone derivatives as byproducts. When 4-methoxy-3-buten-2-one (4) was heated in hot pure water without any additive at 150 °C for 30 min, 1,3,5-triacetylbenzene (5) was obtained in an isolated yield of 77% just by removing water by filtering the crystalline product from the cooled reaction mixture. The reaction did not take place in the absence of
将纯净的1-苯基-和1-(对甲苯基)-2-丙炔-1-酮(分别为1和1 ')在无添加剂的水中于150°C加热2 h以得到1,3,5 -三苯甲酰基-和1,3,5-三-(对甲苯甲酰基)苯(分别为2和2 '),产率分别为74%和52%。进行1与对甲苯甲酰基乙醛的烯酸酯(3 ')和1 '与苯甲酰基乙醛的烯酸酯(3)的交叉反应,得到不对称取代的1-甲苯基-3,5-二苯甲酰苯(Ph 2 Tol)和1 ,3-二甲苯甲酰基-5-苯甲酰苯(PhTol 2),分别证实了先前提出的反应机理,其中通过速率确定HO –对1和1 '的亲核攻击而形成的3和3 '或随后的质子化形成的其共轭酸将用作形成的常见中间体的2,2 '和乙酰苯衍生物作为副产物。将4-甲氧基-3-丁烯-2-酮(4)在无任何添加剂的热纯水中于150°C加热30分钟时,1,3,5-三乙酰苯(5仅通过从冷却的反应混合物中过滤结晶产物除去水就可以得到77%的分