Synthesis of Fluorenones from Benzaldehydes and Aryl Iodides: Dual C–H Functionalizations Using a Transient Directing Group
作者:Xiao-Yang Chen、Seyma Ozturk、Erik J. Sorensen
DOI:10.1021/acs.orglett.7b00161
日期:2017.3.3
The first synthesis of substituted fluorenones directly from benzaldehydes and aryl iodides via a Pd(II)-catalyzed C(sp2)-H functionalization cascade is reported. Featuring anthranilic acid as an inexpensive transient directing group, the process is compatible with a variety of benzaldehydes and aryl iodides. A three-step synthesis of the antiviral drug Tilorone was completed in an excellent overall
报道了通过Pd(II)催化的C(sp2)-H官能化级联直接从苯甲醛和碘代芳烃直接合成取代的芴酮的方法。该工艺以邻氨基苯甲酸为廉价的瞬态导向基团,可与多种苯甲醛和碘代芳基相容。以优异的总收率(40%)完成了抗病毒药物替洛龙的三步合成,证明了该方法的实用性。