A new triflicacid (TfOH)‐mediatedcascadecyclization of ortho‐anisole‐substituted aryldiynes is described for the construction of indeno[1,2‐c]chromenes. The cascadecyclization proceeds through an unusual TfOH‐induced alkyne‐alkyne cyclization followed by nucleophilic attack of the methoxy group on the benzylidene cation, which is completely different to the cyclization of ortho‐aniline‐ or ort
描述了一种新的由三氟甲磺酸(TfOH)介导的邻苯甲醚取代的芳基二炔的级联环化反应,用于构建茚并[1,2- c ]苯二酮。级联环化是通过不寻常的TfOH诱导的炔烃-炔烃环化进行的,随后甲氧基对苄叉基阳离子的亲核攻击,这与邻苯胺或邻苯硫基苯甲醚取代的芳基二炔的环化完全不同。合成了以茚并[1,2- c ]亚甲基骨架为供体和π-连接基的一类新型有机染料。这些化合物在染料敏化太阳能电池(DSC)中表现出很高的光伏性能。
Efficient generation of indeno[1,2-c]chromenes via the Pd-catalyzed reaction of 2-alkynylhalobenzenes with 2-alkynylphenols
作者:Yong Luo、Linxiang Hong、Jie Wu
DOI:10.1039/c1cc11169h
日期:——
A palladium-catalyzed reaction of 2-alkynylhalobenzenes with 2-alkynylphenols in the presence of PCy3 is discovered, which provides an efficient and facile route to indeno[1,2-c]chromenes. This reaction works efficiently, leading to the corresponding products in good to excellent yields.
2-Alkynylhalobenzene reacts with 2-alkynylphenol in the presence of a palladium catalyst, leading to indeno[1,2-c]chromenes in good to excellent yields. Furthermore, the scaffold of indeno[1,2-c]chromene could be constructed via a palladium-catalyzed reaction of 2-alkynylbromobenzene with water, in which four bonds are formed with high efficiency.
2-炔基卤代苯在钯催化剂的存在下与2-炔基苯酚反应,生成茚并[1,2- c ]色烯,收率高至优异。此外,脚手架茚并[1,2- c ]色烯可以通过2-炔基溴苯的钯催化与水,其中高效形成四个键。