Four new steroidal glycosides such as 3-O-6-deoxy-3-O-methyl-β-d-allopyranosyl-(1 → 4)-β-d-oleandropyranosyl-(1 → 4)-β-d-cymaropyranosyl-(1 → 4)-β-d-cymaropyranoside-12-β-tigloyl-14-β-hydroxy-17-β-pregnane (1), 3-O-6-deoxy-3-O-methyl-β-d-allopyranosyl-(1 → 4)-β-d-oleandropyranosyl-(1 → 4)-β-d-cymaropyranosyl-(1 → 4)-β-d-cymaropyranoside-12-β-(2'-amino)-benzoyl-14-β-hydroxy-17-β-pregnane (2), 3-O-6-deoxy-3-O-methyl-β-d-allopyranosyl-(1 → 4)-β-d-oleandropyranosyl-(1 → 4)-β-d-cymaropyranosyl-(1 → 4)-β-d-cymaropyranoside-12-β-14-β-dihydroxy-17-α-pregnane (3) and 3-O-6-deoxy-3-O-methyl-β-d-allopyranosyl-(1 → 4)-β-d-oleandropyranosyl-(1 → 4)-β-d-cymaropyranosyl-(1 → 4)-β-d-cymaropyranoside-12-β-14-β-dihydroxy-17-β-pregnane (4) were isolated from the aerial parts of Ceropegia fusca Bolle (Asclepiadaceae), a crassulacean acid metabolism plant, an endemic species to the Canary Islands that has been used in traditional medicine as a cicatrizant, vulnerary and disinfectant. The dichloromethane extract exhibited significant cytostatic activity against HL-60, A-431 and SK-MEL-1 cells, human leukemic, epidermoid carcinoma and melanoma cells, respectively. As shown in Table I, compounds 1 and 2 showed very similar IC50 values. The acetylation of 1 to give the diacetate 5 increases 5-fold the cytotoxicity against HL-60 cells. Compounds 3 and 4 did not show cytotoxicity at the assayed concentrations. With respect to the compounds containing only the steroid ring (6–8), the presence of a charged O-amino-benzoyl but not a tigloyl group improved the cytotoxicity.
                                    四种新的甾体苷,例如3-O-6-脱氧-3-O-甲基-β-d-别
吡喃糖基-(1 → 4)-β-d-齐墩果
吡喃糖基-(1 → 4)-β-d-
吡喃
吡喃糖基-(1 → 4)- β-d-
吡喃酮苷-12-β-替格酰基-14-β-羟基-17-β-孕烷 (1), 3-O-6-脱氧-3-O-甲基-β-d-别
吡喃糖基-(1 → 4)-β-d-齐墩果
吡喃糖基-(1 → 4)-β-d-
吡喃
吡喃糖基-(1 → 4)- β-d-cymaropyranoside-12-β-(2'-
氨基)-苯甲酰基-14-β-羟基-17-β-孕烷(2), 3-O-6-脱氧-3-O-甲基-β-d-别
吡喃糖基-(1 → 4)-β-d-齐墩果
吡喃糖基-(1 → 4)-β-d-
吡喃
吡喃糖基-(1 → 4)-β-d-cymaropyranoside-12-β-14-β-二羟基-17-α-孕烷 (3) 和3-O-6-脱氧-3-O-甲基-β-d-别
吡喃糖基-(1 → 4)-β-d-齐墩果
吡喃糖基-(1 → 4)-β-d-
吡喃
吡喃糖基-(1 → 4)- β-d-cymaropyranoside-12-β-14-β-二羟基-17-β-pregnane (4) 是从Ceropegia fusca Bolle(萝藦科),一种景天科酸代谢植物,是加那利群岛的特有物种,在传统医学中用作疤痕剂、创伤剂和消毒剂。
二氯甲烷提取物分别对 HL-60、A-431 和 SK-MEL-1 细胞、人白血病细胞、表皮样癌和
黑色素瘤细胞表现出显着的细胞抑制活性。如表 I 所示,化合物 1 和 2 显示出非常相似的 IC50 值。 1 乙酰化得到二
乙酸酯 5,对 HL-60 细胞的细胞毒性增加了 5 倍。化合物3和4在测定浓度下没有表现出细胞毒性。对于仅含有类
固醇环 (6-8) 的化合物,带电荷的 O-
氨基苯甲酰基而非替格酰基的存在提高了细胞毒性。