stereospecifically biosynthesized from (S)-reticuline (22) whereas the bisbenzylisoquinoline alkaloids cycleanine (52), N-desmethylcycleanine (51) and the proaporphine alkaloids. pronuciferine (27) and stepharine (26) are derived from (R)-N-methylcoclaurine in young Stephania glabra. The quaternary protoberberine alkaloids (40 to 44) of the plant are formed by dehydrogenation of the corresponding tetrahydroprotoberberines
示踪剂实验表明,四氢protoberberines stepholidine(14),corydalmine(d15),capaurine(19)和corynoxidine(20)是立体立体合成的,是由(S)-网状碱(22)合成的,而双苄基
异喹啉生物碱cyclanine(52),N-去甲基51)和普罗帕啡
生物碱。pronuciferine(27)和stepharine(26)来源于年轻的Stephania glabra中的(R)-N-甲基
钴素。四季原小ber碱
生物碱(40至44通过相应的四氢protoberberines脱氢形成植物的)。