排序方式: 共有23条查询结果,搜索用时 0 毫秒
21.
22.
23.
Paul M. Dewick 《Phytochemistry》1975,14(4):979-982
Feeding experiments with dl-phenylalanine-[1-14C] have demonstrated the de novo synthesis of the pterocarpan phytoalexins demethylhomopterocarpin and maackiain in CuCl2-treated Trifolium pratense L. seedlings. 2′,4′,4-Trihydroxychalcone-[carbonyl-14C] and 7-hydroxy-4′-methoxyisoflavone-[methyl-14C] (formononetin) were readily incorporated into demethylhomopterocarpin and maackiain, but 2′,4′-dihydroxy-4-methoxychalcone-[carbonyl-14C] and 7,4′-dihydroxyisoflavone-[T] (daidzein) proved inefficient precursors. The trihydroxychalcone was also an excellent precursor of formononetin in T. pratense, but the trihydroxymethoxychalcone and daidzen were poorly incorporated. These observations offer further evidence that methylation may be an associated part of the mechanism for aryl migration in the biosynthesis of formononetin. 相似文献