Furoquinolines, viz., kokusagine (I), maculine (II), dictamnine (III) and 6-methoxydictamine (IV) were synthesized via ethyl 2-anilino-4,5-dihydro-4-oxofuran-3-carboxylate derivatives. 6-Methoxy-2-methyldictaminne (V) and its dihydro-derivative (XXI) were synthesized via analogous ethyl 4,5-dihydro-2-(4-methoxyanilino)-5-methyl-4-oxofuran-3-carboxylate. Stereochemical assignments of 2,3-cis and trans 2,3-dihydro-3-hydroxy-4,6-dimethoxy-2-methylfuro[2,3-b]quinoline having insect antifeeding activity were made on the basis of their spectrometric data (PMR and MS).
通过 2-
苯胺基-4,5-二氢-4-氧杂
呋喃-3-
甲酸乙酯衍
生物合成了
呋喃喹啉类化合物,即 kokusagine (I)、maculine (II)、dictamnine (III) 和 6-甲氧基二ictamine (IV)。通过类似的 4,5-二氢-2-(4-
甲氧基苯胺基)-5-甲基-4-氧代
呋喃-3-
羧酸乙酯,合成了 6-甲氧基-2-甲基二ictaminne (V) 及其二氢衍
生物 (XXI)。根据其光谱数据(PMR 和 MS),对具有昆虫抗药性的 2,3-顺式和反式 2,3-二氢-3-羟基-4,6-二甲氧基-
2-甲基呋喃并[2,3-b]
喹啉进行了立体
化学鉴定。