Lupan-3-one (5) was irradiated in n-hexane under an argon atmosphere using a high pressure mercury lamp. Besides three seco compounds, namely 10α-(2-formylethyl)-5β-isopropenyl-des-A-lupane (6), 10α-(2-carboxyethyl)-5β-isopropyl-des-A-lupane (8), and 10α-(2-carboxyethyl)-5β-isopropenyl-des-A-lupane (9), two seco-nor compounds, 10α-(carboxymethyl)-5β-isopropyl-des-A-lupane (7) and lactone of 10α-(carboxymethyl)-5α-hydroxy-5β-isopropyl-des-A-lupane (10), have been isolated and their structures have been determined. NMR signals of 10 were examined using Eu(fod)3-d27 as a shift reagent.
Lupan-3-one (5) 在
氩气气氛下使用高压
汞灯在
正己烷中照射。除了三种seco化合物,分别是10α-(2-甲醛乙基)-5β-异
丙烯基-des-A-鲁潘 (6),10α-(2-羧乙基)-5β-异丙基-des-A-鲁潘 (8),和10α-(2-羧乙基)-5β-异
丙烯基-des-A-鲁潘 (9),还分离出了两种seco-nor化合物,即10α-(羧甲基)-5β-异丙基-des-A-鲁潘 (7)和10α-(羧甲基)-5α-羟基-5β-异丙基-des-A-鲁潘的内酯 (10),并已确定其结构。使用Eu(fod)3-d27作为移位试剂对10的NMR信号进行了分析。