Synthesis of Phenylthiomethyl Substitution Furans by Lewis Acid Catalysed Substitution
作者:Nicholas Greeves、Julie S. Torode
DOI:10.1055/s-1993-26011
日期:——
Two routes to the differentially functionalised trisubstituted furan methyl 4-methyl-2-[(phenylthio)methyl]-3-furoate are presented. One is a direct palladium catalysed annulation which proceeds smoothly in the presence of a thioether and the other depends on a highly chemoselective displacement of a methoxy group by phenylthiotrimethylsilane. The scope and mechanism of the latter transformation was probed with simple model systems.
介绍了两条合成不同功能化三取代呋喃甲基4-甲基-2-[(苯硫基)甲基]-3-呋喃酸酯的路线。一条是直接的钯催化环化反应,能在硫醚的存在下顺利进行;另一条依赖于苯硫基三甲基硅烷对甲氧基的高度化学选择性取代。对后者转化的范围和机制进行了简单模型体系的研究。