coupling with a naphthalene portion. During the feeding experiments, a new alkaloid was discovered, 5′-O-methyldioncophylline D (5). It is the first 7,8′-linked (d-type) naphthylisoquinoline isolated from a Dioncophyllaceae plant. The new alkaloid consists of two closely eluting, slowly interconverting atropo-diastereomers, (P)-5 and (M)-5. Their full absolute stereostructures were assigned, i.e.,
天然
四氢异喹啉茶碱(4)以[1,1'- 13 C 2 ]标记的特定形式合成,并饲喂到pel藜的愈伤组织培养物中。它被掺入
萘异喹啉碱
生物碱中,其中以氢
溴替林A(8)(由1 H,13 C NMR和2D I
NADEQUATE实验证明),证明4是与
萘进行酶介导的
酚氧化偶联的可靠偶联底物。一部分。在进食实验中,发现了一种新的
生物碱,即5'- O-甲基二
硫代茶碱D(5)。这是第一个7,8'-连接的(d从Dioncophyllaceae植物分离的
萘型
异喹啉。新的
生物碱由两个紧密洗脱,缓慢互变的非对映体非对映异构体(P)-5和(M)-5组成。通过光谱学和在线HPLC-CD研究确定了它们的绝对绝对立体结构。