人参皂苷化合物K(CK)对哮喘的治疗具有较强的抗IgE活性。然后通过简单的方法合成了一系列CK类似物。在体内使用OVA诱导的哮喘小鼠模型中抗IgE活性的评估揭示了CK类似物,其表明,糖的类型,在A环和CK的C20侧链修饰所有受影响的多对活动的初步的SAR。最初的SAR优化导致发现了化合物T1,T2,T3,T8和T12与CK(1501.85±184.66 ng / mL)相比,具有更好的抗哮喘作用(IgE值分别为1237.11±106.28、975.82±160.32、1136.96±121.85、1191.08±107.59和1258.27±148.70 ng / mL)。 )。这些有效的化合物可以作为进一步开发的线索。
A synthetic method of 20(s)-ginsenoside Rh2, that is 20(S)-protopanaxdiol-3-O-β-D-glucopyranoside, is comprised of: protecting protopanaxdiol (A1) selectively first to produce monosubstituted protopanaxdiol (A2); and Glycosidating the monosubstituted protopanaxdiol with Glucopyranosyl donor in the presence of Lewis acid catalyst; Deprotecting the product; Then separating and purifying to obtain 20(s)-ginsenoside Rh2. The method is conducted under mild condition at low cost, and affords product with high stereoselectivity, high yield and purity. Therefore, the synthetic method of the present invention is suitable for production on large scale.
Synthesis of ginsenoside Rh2 and chikusetsusaponin-LT8 via gold(I)-catalyzed glycosylation with a glycosyl ortho-alkynylbenzoate as donor
作者:Jinxi Liao、Jiansong Sun、Yiming Niu、Biao Yu
DOI:10.1016/j.tetlet.2011.04.003
日期:2011.6
Glycosylation of the acid labile protopanaxadiol derivatives was succeeded with a glycosyl ortho-hexynylbenzoate as donor under the catalysis of PPh(3)AuNTf(2), leading to the subsequent elaboration of ginsenoside Rh2 and chikusetsusaponin-LT8 in a concise manner. (C) 2011 Elsevier Ltd. All rights reserved.