Two new neo-clerodane diterpenoids from Scutellaria barbata.
Two new neo-clerodane diterpenoids, 6,7-dibenzoyloxybarbatin C (1, named barbatin D) and 6-(2-acetoxy-3-methylbutanoloxy)-7-(2-carbonyl-3-methylbutanoyloxy) barbatin C (2, named barbatin E) were isolated from the whole plant of Scutellaria barbata D. Don. Their structures were elucidated by spectroscopic methods including extensive 1D and 2D NMR analyses. In vitro, compounds 1-2 showed cytotoxic activities against three human cancer lines, namely, HONE-1 nasopharyngeal, KB oral epidermoid carcinoma, and HT29 colorectal carcinoma cells, and with IC(50) values in the range of 3.5-6.7 microM.
Dai
Sheng-Jun
SJ
School of Pharmaceutical Science, Yantai University, Yantai 264005, China. daishengjun_9@hotmail.com
Shen
Li
L
Ren
Yan
Y
D000972:Antineoplastic Agents, Phytogenic / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D016923:Cell Death / Q000187:drug effects; D045744:Cell Line, Tumor; D004224:Diterpenes / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D045785:Diterpenes, Clerodane / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D004354:Drug Screening Assays, Antitumor; D006801:Humans; D009682:Magnetic Resonance Spectroscopy; D031363:Scutellaria / Q000737:chemistry*
D000972:Antineoplastic Agents, Phytogenic; D004224:Diterpenes; D045785:Diterpenes, Clerodane