Rearrangements of 4-(2-Aminophenyl)-1,4-dihydro-2,6-dimethyl-3,5-pyridinedicarboxylic acid diethyl ester
作者:Dong H. Kim
DOI:10.1002/jhet.5570230543
日期:1986.9
5-pyridinecarboxylic acid diethyl ester (III) with refluxing toluene or pyridine afforded 1,2,3,6-tetrahydro-2,4-dimethyl-2,6-methano-1,3-benzodiazocine-5,11-dicarboxylic acid diethyl ester (IV) as the major product. In addition, the following minor products were isolated: 2-methyl-3-quinolinecarboxylic acid ethyl ester (V), 3-(2-aminophenyl)-5-methyl-6-azabicyclo[3,3,1]-hept-1-ene-2,4-dicarboxylic acid diethyl ester
用回流的甲苯或吡啶处理4-(2-氨基苯基)-1,4-二氢-2,6-二甲基-3,5-吡啶甲酸二乙酯(III),得到1,2,3,6-四氢-主要产物为2,4-二甲基-2,6-甲基-1,3-苯并重氮-5,11-二羧酸二乙酯(IV)。此外,还分离出以下次要产物:2-甲基-3-喹啉羧酸乙酯(V),3-(2-氨基苯基)-5-甲基-6-氮杂双环[3,3,1]-庚-1 -烯-2,4-二羧酸二乙酯(VI)和5,6-二氢-2,4-二甲基-5-氧代苯并[ c ] [2,7]萘吡啶-1-甲酸乙酯(VII) 。相反,酸性条件导致III以95%的产率转化为V。后者的形成似乎涉及IV作为中间体,因为IV在酸中迅速降解以定量收率得到V。