毛萼梅根化学成分研究

CHEMICAL CONSTITUENTS FROM THE ROOT OF RUBUS CHROOSEPALUS

摘要: 目的　研究毛萼梅根部的化学成分。方法　将MeOH提取物分散于水中,经EtOAc萃取后用柱色谱分离纯化,通过波谱方法鉴定化合物。结果　鉴定了7个化合物:2α,3β-二羟基乌苏-12,19-二烯-23,28-二酸(I),2α,3β,23-三羟基乌苏-12,18-二烯-28-酸(IIa),2α,3β,23-三羟基乌苏-12,19-二烯-28-酸(IIb),2α,3α-二羟基乌苏-12,18-二烯-28-酸(IIIa),2α,3α-二羟基乌苏-12,19-二烯-28-酸(IIIb),及化合物IIIa，IIIb的C-2,C-3位缩酮IVa和IVb。结论　I是1个新三萜酸。

Abstract: AIM　To investigate the chemical constituents of Rubus chroosepalus Focke. METHODS The methanol extracts were suspended in H₂O and then extracted with EtOAc. Column chromatography was used for separation and purification, while spectral analysis was used for identification. RESULTS　Seven compounds were isolated and identified as 2α,3β-dihydroxy-urs-12,19-dien-23,28-oic acid (I), 2α,3β,23-trihydroxy-urs-12,18-dien-28-oic acid (IIa), 2α,3β,23-trihydroxy-urs-12,19-dien-28-oic acid (IIb), 2α,3α-dihydroxy-urs-12,18-dien-28-oic acid (IIIa), 2α,3α-dihydroxy-urs-12,19-dien-28-oic acid (IIIb), and the acetonide of IIIa and IIIb (IVa and IVb). CONCLUSION　I was found to be a new pentacyclic triterpenoid acid.