Conversion of Spirostane and Solanidane into Pregnane (1)Introduction of Oxygen Function into C-23
作者:Nodoka Nakata、Asami Tokudome、Hiroyuki Yanai、Toshihiro Nohara
DOI:10.1248/cpb.60.150
日期:——
A spirosolane derivative possessing a hydroxyl group at C-23, esculeogenin A, a sapogenol of tomato saponin, was found to be easily converted into the corresponding pregnane derivative by refluxing with aqueous pyridine. Therefore, introduction of a hydroxyl group into the C-23 of diosgenin (as representative of spirostane derivatives) and solasodine (as representative of spirosolane derivatives) was attempted by the reaction of NaNO2–BF3 · Et2O. In diosgenin, the objective compound was obtained by the reaction in AcOH. However, in solasodine, we obtained a 23-nitroso derivative by the reaction in AcOH and 23,24-bisnorcholanic acid 22-16 lactone, or vespertilin, in AcOH and CHCl3.
一种具有羟基的螺烯衍生物,23位羟基的艾斯库尔根素A,作为西红柿皂苷的皂苷醇,发现其在水相吡啶回流下易于转化为相应的孕烷衍生物。因此,尝试通过NaNO2–BF3·Et2O反应将羟基引入地奥基醇(作为螺烷衍生物的代表)和索拉索丁(作为螺烯衍生物的代表)的C-23位。在地奥基醇中,目标化合物通过在醋酸中反应获得。然而,在索拉索丁中,我们通过在醋酸中的反应获得了23-亚硝基衍生物,以及在醋酸和氯仿中的反应获得了23,24-双诺基胆酸22-16内酯,或称为蝙蝠素。