Pyrolysis of quinoline-3,4-dicarboxylic anhydrides bearing 2-phenyl, 2-benzyl and 2-o-tolyl substituents: Formation of products of carbene insertion and addition
作者:Roger F.C. Brown、Karen J. Coulston、Frank W. Eastwood、Mark R. Moffat
DOI:10.1016/s0040-4020(01)90386-2
日期:1992.9
Flash vacuum pyrolysis of 2-phenylquinoline-3,4-dicarboxylic anhydride at 800°/0.06 mm gave indeno[1,2-b]indole (30–40%), which readily added nucleophiles Y− at C-10 to give 5,10-dihydro derivatives (Y H, Me, Ph, NEt2, OMe, CH(COOMe)2 and CMe2NO2). Similar pyrolysis of the 2-benzylquinoline anhydride gave a 1:2 mixture of the (expected) linear 5H-benzo[b]carbazole and the (unexpected) angular 7H-benzo[c]carbazole
2-苯基-3,4-二羧酸酐,在800℃/0.06毫米的闪热解真空,得到茚并[1,2- b ]吲哚(30-40%),容易地添加亲核体Y,它-在C-10,得到5- ,10-二氢衍生物(Y H,Me,Ph,NEt 2,OMe,CH(COOMe)2和CMe 2 NO 2)。对2-苄基喹啉酸酐进行类似的热解,得到(预期的)直链5 H-苯并[ b ]咔唑和(意外的)有角7 H-苯并[ c ]咔唑的1:2混合物。在类似的热解过程中,异构体2-邻甲苯基喹啉酐主要生成11 H-苯并[ a]]咔唑(85%),异构苯并咔唑(4%)和11 H-茚并[1,2- b ]喹啉(2.6%)。这些产品中的大多数可能是由芳烃-卡宾平衡形成的环外卡宾衍生而来,但最后的化合物可能是由芳烃-甲基直接相互作用形成的。