2-Carboxy-4-oxo-1-tetralone (COT), 2-carboxy-4-hydroxy-1-tetralone (CHT), prenyl-COT (4), and prenyl-CHT (5) are on the biosynthetic pathway of naphthoquinones; (ii) the route passing through COT → prenyl-COT (4)→ catalponone (6) is the main pathway of the biosynthesis of naphthoquinones, whereas there exists a subsidiary route passing through CHT → prenyl-COT (5)→ catalponol (2); (iii) regarding the key intermediates
在Catalpa ovata的愈伤组织中施用14 C标记的4-(2-羧基苯基)-4-氧代
丁酸(3)后的稀释分析显示以下结果:(i)2-Carboxy-4-oxo-1-tetralone (COT),2-羧基-
4-羟基-1-四氢
萘酮(CHT),
异戊二烯基COT(4)和
异戊二烯基CHT(5)在
萘醌的
生物合成途径中; (ii)通过COT →异
戊烯基-COT (4)→
过氧化氢萘酮(6)的途径是
萘醌
生物合成的主要途径,而存在通过CHT →
异戊二烯-COT(5)→
过氧化氢萘酚(2 )的辅助途径); (iii)关于关键中间体异
戊烯基-COT(4)和Catalponone(6),(2 S)-异
戊烯基-COT [(2S)-(4)]和(2 R)-catalponone [(2 R)-(6)]参与
生物合成,并且烯丙基化和脱羧化都立体选择性地进行。(iv)将酸(3)掺入愈伤组织中的
甲萘醌-1(7),1-羟基-2-