A New Method for the Synthesis of Nonsymmetrically Substituted Bis(azulen-1-yl) Ketones
作者:Rolf Sigrist、Hans-Jürgen Hansen
DOI:10.1002/hlca.201000032
日期:——
The 1‐(3‐methylazulen‐1‐yl)alkan‐1‐ones, when oxidized with excess 2,3‐dichloro‐5,6‐dicyano‐1,4‐benzoquinone (=4,5‐dichloro‐3,6‐dioxocyclohexa‐1,4‐diene‐1,2‐dicarbonitrile; DDQ) in aqueous acetone in the presence of 1‐(3‐demethylazulen‐1‐yl)alkan‐1‐ones, form the corresponding unsymmetrically substituted bis(3‐acylazulen‐1‐yl)methanones in good to excellent yields (Schemes 4, 5, 7, and 10). Intermediates
1-(3-甲基azulen-1-基)烷烃-1-酮被过量的2,3-二氯-5,6-二氰基-1,4-苯醌(= 4,5-二氯-3,6氧化)时在1-(3-demethylazulen-1-yl)alkan-1-one存在下的丙酮水溶液中的-dioxocyclohexa-1,4-diene-1,2-dicarbonitrile; DDQ)形成相应的不对称取代的bis(3-酰基la烯-1-基)甲烷酮,收率良好至优异(方案4、5、7和10)。中间体是相应的二取代甲烷衍生物,由自由基和自由基阳离子重组形成(方案6)。1-(3-甲基azulen-1-基)烷烃-1-酮也可以与a烯本身,苯并[ a ] az烯或1,3-二甲氧基苯氧化偶联(方案9-11)。