Reactions of diazo ketones with activated unsaturated compounds in the presence of gallium trichloride
作者:R. A. Novikov、Yu. V. Tomilov、O. M. Nefedov
DOI:10.1007/s11172-014-0444-7
日期:2014.2
Diazoacetone reacts with methyl acrylate in the presence of anhydrous GaCl3 to give isomeric methyl 2-acetylcyclopropanecarboxylates rather than pyrazolines obtained from diazo esters or by noncatalytic reactions. In a similar reaction, diazoacetophenone yields methyl 2-benzoylcyclopropanecarboxylates, benzoylmethyl acrylate, and benzoylmethyl 2-benzoylcyclopropanecarboxylate via partial transesterification
在无水 GaCl3 存在下,重氮丙酮与丙烯酸甲酯反应生成异构的 2-乙酰环丙烷羧酸甲酯,而不是从重氮酯或通过非催化反应获得的吡唑啉。在类似的反应中,重氮苯乙酮通过部分酯交换反应生成 2-苯甲酰环丙烷羧酸甲酯、丙烯酸苯甲酰甲酯和 2-苯甲酰环丙烷羧酸苯甲酰甲酯。在 CH2Cl2-HCl-H2O 系统中将等摩尔量的 GaCl3 添加到重氮丙酮中意外地产生 4,5-二甲基呋喃-3(2H)-one 和 1,1'-oxybis(propan-2-one)。