Radical Cyclization in Heterocycle Synthesis. 11.<sup>1</sup> A Novel Synthesis of α,β-Disubstituted γ-Lactones via Sulfanyl Radical Addition−Cyclization Using Hydroximates as a Tether
作者:Okiko Miyata、Atsuko Nishiguchi、Ichiya Ninomiya、Keiichi Aoe、Kimio Okamura、Takeaki Naito
DOI:10.1021/jo000472w
日期:2000.10.1
of sulfanyl radical addition-cyclization of dienes connected with hydroximates and subsequent conversion of the resulting cyclic hydroximate to the lactones provides a novel method for the construction of alpha,beta-disubstituted gamma-lactones. Upon treatment with thiophenol in the presence of AIBN, dienes connected with hydroximates smoothly underwent sulfanyl radical addition-cyclization to give
与氢肟酸酯连接的二烯的硫烷基自由基加成环化和随后将所得环状氢肟酸酯转化成内酯的组合为构建α,β-二取代的γ-内酯提供了一种新颖的方法。在AIBN存在下用苯硫酚处理后,与氢氧肟酸酯连接的二烯顺利进行亚硫烷基自由基加成-环化反应,得到环状顺式和反式氢氧酸酯。环状氢肟酸酯的水解以高收率得到所需的顺式和反式内酯。该方法已成功应用于(+/-)-氧代-对-苯甲内酯的实际合成。