Direct construction of fused aromatic ring systems by "zipper-mode" double C-H bond activation is described. Treatment of (Z)-3-bromo-N(2-bromo-3-phenylprop-2-enyl)aniline derivatives with a catalytic amount of Pd(OAc)(2) and PCy3 center dot HBF4 in the presence of Cs2CO3 in dioxane affords 4,5-naphtho[3,2,1-cd]indole derivatives in good yields. Introduction of heterocycles such as benzofuran, benzothiophene, or indole moieties into the substrates leads to the efficient construction of highly fused heterocyclic aromatic ring systems via C-H bond activation of the heteroaromatic rings.
Double CH Functionalization in Sequential Order: Direct Synthesis of Polycyclic Compounds by a Palladium-Catalyzed CH Alkenylation-Arylation Cascade
Palladium‐catalyzed cascade CH alkenylation and arylation provides convenient access to polycyclic aromatic compounds. Treatment of 3‐bromoaniline derivatives bearing a bromocinnamyl group on the nitrogen atom with a catalytic amount of [Pd(OAc)2] and PCy3⋅HBF4 in the presence of Cs2CO3 in dioxane affords naphthalene‐fused indole derivatives in good yields. This double cyclization reaction is also
钯催化的级联CH烯基化和芳基化提供了多环芳族化合物的便捷通道。3-溴苯胺衍生物支承在氮原子上的bromocinnamyl组[将Pd(OAc)催化量的治疗2 ]和PCY 3 ⋅HBF 4中Cs的存在2 CO 3在良好的二恶烷,得到萘稠合的吲哚衍生物产量。该双环化反应也适用于杂环底物,通过杂环C产生含杂芳环的稠合吲哚,如二苯并呋喃,二苯并噻吩,咔唑,吲哚或苯并呋喃。盐基化。当使用2,6-未取代的苯胺衍生物时,首个CH芳基化反应优先在苯胺环的受阻位置进行。