Thermal Reaction of Azulenes with Dimethyl Acetylenedicarboxylate in Supercritical Carbon Dioxide
作者:Richard Hunziker、David Sperandio、Hans-J�rgen Hansen
DOI:10.1002/hlca.19950780322
日期:1995.5.10
(cf. Scheme 2) was not observed. Similarly, benz[a]azulene (25) yielded in supercritical CO2 (150°/170 bar) in the presence of 4 equiv. of ADM dimethyl benzo[d]heptalene-6,7-dicarboxylate (29; 30%) and dimethyl benzo[a]cyclopent[cd]azulene-1,2-dicarboxylate (28; 22%; Scheme 5). The reaction of 5,9-diphenylbenz[a]azulene (26) and ADM in supercritical CO2 (100°/150 bar) gave the corresponding benzo[d]heptalene-6
1,3,4,6,8-五甲基az(9),当在4当量存在下于150 bar的超临界CO 2中于100°加热时。炔二羧酸二甲酯(ADM)的形成导致16%的3,5,6,8,10-五甲基庚二烯-1,2-二羧酸二甲酯12a和其双键转移异构体12b的1:1混合物的形成以及4%的相应的氮杂1,2-二羧酸13(方案4)。没有观察到[1 + 2]加合物11的形成(参见方案2)。同样,在超临界CO 2中生成苯并[ a ] azulene(25)(150°/ 170 bar)在4当量的情况下 制备ADM二甲基苯并[ d ]庚烯-6,7-二羧酸酯(29; 30%)和二甲基苯并[ a ]环戊[ cd ]]并1,2-二羧酸二甲酯(28; 22%;方案5)。5,9-二苯基苯并[ a ] azulene(26)和ADM在超临界CO 2(100°/ 150 bar)中的反应得到相应的苯并[ d ]庚二烯-6,7-二羧酸31(22%)和二甲基5