Efficient Synthesis of 3-Chloromethyl-2(5<i>H</i>)-furanones and 3-Chloromethyl- 5,6-dihydropyran-2-ones via the PdCl<sub>2</sub>-Catalyzed Chlorocyclocarbonylation of 2,3- or 3,4-Allenols
作者:Xin Cheng、Xuefeng Jiang、Yihua Yu、Shengming Ma
DOI:10.1021/jo8015677
日期:2008.11.21
was formed between the center carbon atom of the allene moiety and the hydroxyl oxygen, which was established by the X-ray single crystal diffraction study of gamma-lactone 3p. The highly optically active 3-chloromethyl-2(5H)-furanones could be easily prepared from the readily available optically active 2,3-allenols. A mechanism for this reaction was proposed.
一种温和有效的方法,涉及PdCl2催化的2,3或3,4-烯丙醇与CuCl2的氯环羰基化反应,用于合成3-氯甲基-2(5H)-呋喃酮和3-氯甲基-5,6-二氢吡喃-2-的开发。该反应以高度区域选择性的方式进行,即,将氯原子引入到丙二烯部分的末端位置,而在内酯键的中心碳原子与由X建立的羟基氧之间形成内酯键。内酯3p的X射线单晶衍射研究。高光学活性的3-氯甲基-2(5H)-呋喃酮可以容易地由容易获得的光学活性的2,3-烯醇制备。提出了该反应的机制。