Palladium-Assisted “Aromatic Metamorphosis” of Dibenzothiophenes into Triphenylenes
作者:Dhananjayan Vasu、Hideki Yorimitsu、Atsuhiro Osuka
DOI:10.1002/anie.201501992
日期:2015.6.8
Two new palladium‐catalyzed reactions of aromatic sulfur compounds enabled the conversion of dibenzothiophenes into triphenylenes in four steps. This transformation of one aromatic framework into another consists of 1) 4‐chlorobutylation of the dibenzothiophene to form the corresponding sulfonium salt, 2) palladium‐catalyzed arylative ring opening of the sulfonium salt with a sodium tetraarylborate
芳香族硫化合物的两个新的钯催化反应使二苯并噻吩在四个步骤中转化为苯并菲。一种芳族骨架向另一种芳族骨架的转化包括:1)二苯并噻吩的4-氯丁基化反应形成相应的sulf盐; 2)钯盐与四芳基硼酸钠的钯催化的芳基开环反应; 3)分子内S N 2反应以形成teraryl锍盐,和4)的钯催化的分子内ç S / C H至电palladation耦合。以量身定制的方式合成了所需的对称和不对称的三亚苯基,其总收率令人满意。