Isomerization and Application of Aroylnorbornenecarboxylic Acids for Stereoselective Preparation of Heterocycles
作者:Géza Stájer、Ferenc Miklós、Pál Sohár、Antal Csámpai、Reijo Sillanpää、Mária Péter
DOI:10.3987/com-02-9619
日期:——
diendo-3-aroylbicyclo[2.2.1]heptane-2-carboxylic acids (1 and la) isomerize to exo-3-aroylbicyclo[2.2.1]heptane-endo-2-carboxylic acids (2 and 2a). Similar endo→exo and even exo → endo isomerization of the aroyl group occurred when the Diels-Alder product containing a mixture of 3-exo-p-toluoylbicyclo[2.2.1 ]hept-5-ene-2-endo-carboxylic acid (4) and 3-endo-p-toluoylbicyclo[2.2.1]hept-5-ene-2-exo-carboxylic
当在酸性或碱性溶液中煮沸时,二内-3-芳酰基双环[2.2.1]庚烷-2-羧酸(1和1a)异构化为外-3-芳酰基双环[2.2.1]庚烷-内-2-羧酸( 2 和 2a)。当 Diels-Alder 产品含有 3-exo-p-toluoylbicyclo[2.2.1]hept-5-ene-2-endo-carboxy 酸的混合物时,芳酰基会发生类似的 endo→exo 甚至 exo→endo 异构化( 4) 和 3-endo-p-toluoylbicyclo[2.2.1]hept-5-ene-2-exo-carboxy acid (5) 与双功能试剂反应:邻氨基苯硫酚、3-氨基-1-丙醇、1、 4-二氨基丁烷或二外-3-羟甲基双环[2.2.1]庚烷-2-胺。所有反应均产生降冰片烯二环和二环稠合杂环 (6) 和 (7, 8 和 10, 9 和 11, 或 12 和 13) 的混合物,它们被分离并通过