Scalable Synthesis of Oxazolones from Propargylic Alcohols through Multistep Palladium(II) Catalysis: β-Selective Oxidative Heck Coupling of Cyclic Sulfonyl Enamides and Aryl Boroxines
作者:Santosh Kumar Alamsetti、Andreas K. Å. Persson、Tuo Jiang、Jan-E. Bäckvall
DOI:10.1002/anie.201307471
日期:2013.12.16
unusual β selectivity to generate a variety of branched substituted oxazolones (see scheme; Ts=p‐toluenesulfonyl). The three‐step synthesis from readily available starting materials with a simple palladium catalyst and inexpensive reagents could be carried out in a single reaction vessel or scaled up for the preparation of large amounts of these amino acid precursors.
规模的鲸鱼:标题的氧化性Heck偶联以异常的β选择性进行,生成了各种支链取代的恶唑酮(参见方案; Ts =对甲苯磺酰基)。用简单的钯催化剂和廉价的试剂从容易获得的起始原料进行三步合成可以在单个反应容器中进行或按比例放大以制备大量这些氨基酸前体。