Palladium-Catalyzed Annulation of Internal Alkynes: Direct Access to π-Conjugated Ullazines

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• 作者：Danyang Wan ; Xiaoyu Li ; Ruyong Jiang ; Boya Feng ; Jingbo Lan ; Ruilin Wang ; Jingsong You
• 刊名：Organic Letters
• 出版年：2016
• 出版时间：June 17, 2016
• 年：2016
• 卷：18
• 期：12
• 页码：2876-2879
• 全文大小：419K
• 年卷期：0
• ISSN：1523-7052

文摘

A palladium-catalyzed cyclization reaction of 1-(2,6-dibromophenyl)-1H-pyrroles with alkynes has been developed to construct various π-conjugated indolizino[6,5,4,3-ija]quinolones (ullazines) with a reactive functional group tolerance. As illustrative examples, three new ullazine-based sensitizers are synthesized, and the performance of these dyes is examined in DSSC devices, which demonstrates the potential of direct C–H functionalization in the construction of organic optoelectronic materials.