The Pacific sponge Aplysina fistularis was fed cholesterol-[4-14C],(24R)-methyl-25-dehydrocholesterol-[26-14C] (epicodisterol[26-14C]), (24S)-methyl-25-dehydrocholesterol-[26-14C] (codisterol-[26-14C]), and 24-methylenecholesterol-[28-14C]. Only epicodisterol, which has the same stereochemistry at C-24 as (24R,25S)-24,26-dimethylcholesterol (aplysterol), was converted with high efficiency into (24R)-24
太平洋海绵Aplysina fistularis供给
胆固醇[4- 14 C],(24 - [R )-甲基-25- dehydrocholesterol- [26- 14 C](epicodisterol [26- 14 C]),(24小号) -甲基25 dehydrocholesterol- [26- 14 C](codisterol- [26- 14 C]),和24 methylenecholesterol- [28- 14 C]。仅将在24位具有与(24 R,25 S)-24,26-二甲基
胆固醇(apstersterol)相同的立体
化学的表二十碳五烯醇高效转化为(24 R)-24,27-二甲基-25-脱氢
胆固醇(25-脱氢
磷脂固醇)。进一步的侧链延伸[至E-(24还可以证明R)-24,26,27-三甲基-25-脱氢
胆固醇(verongulasteraster)]。