The α-Chlorination of Aryl Ketones with Manganese(III) Acetate in the Presence of Chloride Ion
作者:Takehiko Tsuruta、Tetsuya Harada、Hiroshi Nishino、Kazu Kurosawa
DOI:10.1246/bcsj.58.142
日期:1985.1
The reaction of 2-(4-methoxyphenyl)-4-chromanone with Mn(OAc)3 in the presence of LiCl gave 3,3-dichloro-2-(4-methoxyphenyl)-4-chromanone. The reactions of 2-phenyl-4-chromanone, 1-phenyl-1-propanone, 1,2-diphenylethanone, and 1-tetralone similarly yielded α,α-dichloro derivatives in good yields. 2,2,2-Trichloroacetophenones were obtained from 2,2-dichloroacetophenones, but in the absence of LiCl, 2,2-dichloroacetophenones gave 2,2,3,3-tetrachloro-1,4-butanediones. KCl, NaCl, NH4Cl, AlCl3, and CaCl2 were also employed as the Cl− ion source. Synthetic applicability and the reaction mechanisms are discussed briefly.
2-(4-甲氧基苯基)-4-香豆酮与Mn(OAc)3在LiCl存在下反应,生成3,3-二氯-2-(4-甲氧基苯基)-4-香豆酮。2-苯基-4-香豆酮、1-苯基-1-丙酮、1,2-二苯基乙酮和1-四氢萘酮的反应同样生成α,α-二氯衍生物,产率良好。2,2,2-三氯乙酰苯酮是由2,2-二氯乙酰苯酮得到的,但在没有LiCl的情况下,2,2-二氯乙酰苯酮生成了2,2,3,3-四氯-1,4-丁二酮。KCl、NaCl、NH4Cl、AlCl3和CaCl2也被用作Cl−离子源。合成适用性和反应机制进行了简要讨论。