Synthesis of Diketones and ω-Hydroxy Ketones from Methyl Ketones and α,ω-Diols by an [IrCl(cod)]<sub>2</sub>/PPh<sub>3</sub>/KOH System
作者:Kensaku Maeda、Yasushi Obora、Satoshi Sakaguchi、Yasutaka Ishii
DOI:10.1246/bcsj.81.689
日期:2008.6.15
ω-Hydroxy ketones and diketones, which are important starting materials for the synthesis of cycloalkanones and heterocyclic compounds, were prepared by the one-step reaction of methyl ketones with α,ω-diols under the influence of an iridium complex and a base. The selectivity of ω-hydroxy ketones and diketones could be controlled by varying the starting ratio of methyl ketones to α,ω-diols. For example, reaction using acetophenone (5 equiv) with respect to 1,6-hexanediol (1 equiv) in the presence of [IrCl(cod)]2, PPh3, and KOH without solvent gave 1,10-diphenyl-1,10-decanedione in almost quantitative yield, while reaction using acetophenone (1 equiv) to 1,6-hexanediol (4 equiv) led to 8-hydroxy-1-phenyl-1-octanone in 92% yield. This methodology was successfully extended to the reaction of arylacetonitriles with α,ω-diols leading to diaryldinitriles.
ω-羟基酮和二酮是一类重要的起始材料,用于合成环烷酮和杂环化合物。通过在铱配合物和碱的作用下,甲基酮与α,ω-二醇一步反应制备得到了这些化合物。通过改变甲基酮与α,ω-二醇的起始摩尔比,可以控制ω-羟基酮和二酮的选择性。例如,在没有溶剂的情况下,使用乙酰苯(5 equiv)相对于1,6-己二醇(1 equiv),在[IrCl(cod)]2、PPh3和KOH的存在下反应,几乎定量地得到了1,10-二苯基-1,10-癸二酮,而使用乙酰苯(1 equiv)与1,6-己二醇(4 equiv)反应,则以92%的收率得到了8-羟基-1-苯基-1-辛酮。这一方法还被成功地扩展到芳基乙腈与α,ω-二醇的反应,产生了二芳基二腈。