Modular Construction of Fluoroarenes from a New Difluorinated Building Block by Cross-Coupling/Electrocyclisation/Dehydrofluorination Reactions
作者:Jonathan M. Percy、Helena Emerson、James W. B. Fyfe、Alan R. Kennedy、Sergej Maciuk、David Orr、Lucie Rathouská、Joanna M. Redmond、Peter G. Wilson
DOI:10.1002/chem.201601584
日期:2016.8.16
were used to assemble precursors to 6π‐electrocyclisations of three different types. Electrocyclisations took place at temperatures between 90 and 240 °C, depending on the central component of the π‐system; nonaromatic trienes were most reactive, but even systems that required the temporary dearomatisation of two arenyl subunits underwent electrocyclisation, albeit at elevated temperatures. Photochemical
基于新颖且易于合成的二氟化有机三氟硼酸盐的钯催化偶联反应被用于组装前体,以形成三种不同类型的6π电环化反应。电环化发生在90到240°C的温度之间,具体取决于π系统的中心组成。非芳族三烯具有最高的反应活性,但是即使需要将两个戊基亚基暂时脱芳香化的系统也要进行电环化,尽管温度较高。光化学条件对于这些更苛刻的反应是有效的。该方法包通过灵活的途径提供了结构上多样化的氟化芳烃组,其跨越20kcal mol -1的反应性范围。