We report here a two-in-one strategy for the Pd(II)-catalyzed tandem C–H arylation/decarboxylative annulation between readily available cyclic diaryliodoniumsalts and benzoic acids. The carboxylic acid functionality can be used as both a directing group for the ortho-C–H arylation and the reactive group for the tandem decarboxylative annulation. By a step-economical double cross-coupling annulation
Highly Efficient Route to Fused Polycyclic Aromatics via Palladium-Catalyzed Aryne Annulation by Aryl Halides
作者:Zhijian Liu、Richard C. Larock
DOI:10.1021/jo0619534
日期:2007.1.1
Polycyclic aromatic and heteroaromatic hydrocarbons have been synthesized in high yield by two different processes involving the Pd-catalyzed annulation of arynes. The first process involves a Pd-catalyzed annulation of arynes by 2-halobiaryls and related vinylic halides. The second process utilizes a Pd-catalyzed double annulation of arynes by simple aryl halides. Both processes appear to involve
Palladium Catalyzed C–I and Vicinal C–H Dual Activation of Diaryliodonium Salts for Diarylations: Synthesis of Triphenylenes
作者:Xunshen Wu、Jianwei Han、Limin Wang
DOI:10.1021/acs.joc.7b01905
日期:2018.1.5
we report an approach for direct diarylations of 2-bromobiphenyls or bromobenzenes. As a result, a wide range of triphenylenes with various substituents have been synthesized in good yields. These triphenylenes are expected to be employed in the “bottom-up” synthesis of functional aromatic molecules in material science.
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。