Incubation of marinobufagin (1) with cultures of Fusarium lini (BOLLEY) gave the unknown 12β-hydroxymarinobufagin (2). The structure of 2 was proved by the degradation of its diacetyl derivative 3 to methyl 3, 12-dioxo-14-hydroxy-Δ4-14β, 17αH-etianate (6) which was prepared from the known methyl 3-oxo-12β, 14-dihydroxy-Δ4-14β, 17αH-etianate (5).
将马里诺
蟾蜍精(1)与镰刀镰刀菌(BOLLEY)培养物一起孵育,得到未知的12β-羟基
马来酸蟾蜍精(2)。的结构2是由它的
二乙酰的衍
生物3到3-降解证明,12-二氧代-1
4-羟基-Δ 4 -14β,17αH-etianate(6将其与已知的3-氧代- 12β制备), 14二羟基Δ 4 -14β,17αH-etianate(5)。