Facile and Efficient Synthesis of 7,10-Dihydroxy-6H-pyrazolo[4,5,1-de]acridin-6-one via Hypervalent Iodine Oxidation
作者:Nobuyuki Kato、Toru Sugaya、Takashi Mimura、Masanori Ikuta、Sachiko Kato、Yukihiro Kuge、Shinji Tomioka、Masaji Kasai
DOI:10.1055/s-1997-1398
日期:1997.6
An improved synthetic procedure for 5,8-dibromo-7,10-dihydroxy-2-methyl-6H-pyrazolo[4,5,1-de]acridin-6-one (4), an intermediate of a novel class of antitumor agents, was developed. An effective introduction of a hydroxy group to the C10 of 5,8-dibromo-7-hydroxy-2-methyl-6H-pyrazolo[4,5,1-de]acridin-6-one (2b) was accomplished in two steps via the oxidation of 2b to the corresponding quinone using hypervalent iodine reagent in an acidic medium, followed by reduction of the resulting quinone upon treatment with aqueous sodium hydrosulfite.
一种新型抗肿瘤药物的中间体--5,8-二溴-7,10-二羟基-2-甲基-6H-吡唑并[4,5,1-de]吖啶-6-酮(4)的改进合成方法被开发出来。5,8- 二溴-7-羟基-2-甲基-6H-吡唑并[4,5,1-de]吖啶-6-酮(2b)的 C10 上羟基的有效引入分两步完成,第一步是在酸性介质中使用高价碘试剂将 2b 氧化成相应的醌,然后用亚硫酸氢钠水溶液将生成的醌还原。