An Efficient Access to Fluorescent 2,3,4-Tricyanofurans from α-Cyano Ketones Using DDQ as Maleonitrile Building Block
摘要:
An efficient synthetic method was developed for the synthesis of 2,3,4-tricyanofurans from -cyano ketones using DDQ as maleonitrile building block under very mild conditions. This methodology allows for the construction of a new kind of fluorescent core framework.
DDQ-Mediated Oxidative Coupling: An Approach to 2,3-Dicyanofuran (Thiophene)
作者:Zheng-Lin Wang、Hong-Liang Li、Li-Shi Ge、Xing-Lan An、Zi-Gang Zhang、Xiaoyan Luo、John S. Fossey、Wei-Ping Deng
DOI:10.1021/jo4026034
日期:2014.2.7
A facile oxidative coupling of alpha-carbonyl radicals to 2,3-dichloro-5,6-dicyanobenzoquinone (DDQ) for the synthesis of 2,3-dicyanofurans and thiophenes starting from readily available beta-diketones, simple ketones, and beta-keto thioamides in up to 95% yield in one step was developed. Mechanistic investigations revealed that a radical process could be involved in this transformation, and a water promoted C-C bond cleavage pathway is proposed for the formation of 2,3-dicyanofurans and thiophenes.