Novel Dimerization of 3-(2-Nitroethenyl)guaiazulene. A Convenient Route to Cyclopenta[ef]heptalene
作者:Shinji Kurokawa
DOI:10.1246/cl.1993.1109
日期:1993.7
Dimerization of 3-(2-nitroethenyl)guaiazulene with sodium methylate gave 5-(1-guaiazulenyl)-5,6-dihydro-9-isopropyl-1-methyl-4-nitrocyclopenta[ef]heptalene (3). On treatment with formic acid, 3 was converted into 9-isopropyl-1-methyl-4-nitrocyclopenta[ef]heptalene quantitatively. A combination of the reactions provides a convenient route to the cyclopenta[ef]heptalene derivatives.