Pd(II)-Mediated Cyclization of o-Allylbenzaldehydes in Water: A Novel Synthesis of Isocoumarins
摘要:
A novel, concise and efficient synthesis of substituted isocoumarins is disclosed. o-Allylbenzaldehydes prepared from isovanillin were mediated by PdCl2-CuCl2 in water to undergo a domino reaction sequence, including 6-exo-trig cyclization, the addition of water, the elimination of PdHCl, the isomerization of carbon-carbon double bond, the oxidation of hemiacetals with the elimination of PdHCl, and regeneration of PdCl2 in situ to yield a series of new substituted isocoumarins in high yields, in one pot.
Synthesis of 3-Substituted Isocoumarin Derivatives via CuI-Catalyzed Reaction of o-Bromobenzamides with 1,3-Diketones
作者:Chanjuan Xi、Shangjun Cai、Fei Wang
DOI:10.1055/s-0031-1290949
日期:2012.6
Abstract An approach to a variety of 3-substitutedisocoumarins has been developed. The reaction proceeded from o-bromobenzamide derivatives and 1,3-diketones via CuI-catalyzed reaction in DMF under the action of K3PO4 at 120 °C without ligands or additives. An approach to a variety of 3-substitutedisocoumarins has been developed. The reaction proceeded from o-bromobenzamide derivatives and 1,3-diketones
摘要 已经开发出一种用于多种3-取代的异香豆素的方法。该反应由邻溴苯甲酰胺衍生物和1,3-二酮在K 3 PO 4的作用下于120°C下在DMF中经CuI催化的反应在没有配体或添加剂的情况下进行。 已经开发出一种用于多种3-取代的异香豆素的方法。该反应由邻溴苯甲酰胺衍生物和1,3-二酮在K 3 PO 4的作用下于120°C下在DMF中经CuI催化的反应在没有配体或添加剂的情况下进行。