the five-membered ring, and oxidative decarboxylation to generate the key central double bond. The originally suggested stereochemistry for the quaternary center C(5) must be revised, as both C(5) epimers were prepared and a comparison with an authentic sample was made. The absolute configuration of benesudon is 4S,5R,6S.
由
D-葡萄糖通过涉及自由基环化形成五元环,氧化脱羧以生成关键的中央双键的途径,由
D-葡萄糖合成了具有
生物活性的真菌代谢物即致密功能化的
乙烯酮乙缩醛苄酮。由于两个C(5)差向异构体均已制备,并且与真实样品进行了比较,因此必须修改最初建议的四元中心C(5)的立体
化学。贝尼松糖的绝对构型为4S,5R,6S。