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New proazulene guaianolides from Thapsia villosa
U W Smitt1, C Cornett, A Andersen
1Department of Pharmacognosy and Organic Chemistry, Royal Danish School of Pharmacy, Copenhagen.
Journal of Natural Products
|November 1, 1990
Abstract:
Four new guaianolides 2-5 possessing the terpenoid skeleton of archangelolide [6] were isolated from a specimen of Thapsia villosa [chromosome number 2n = 66 (= 6x)]. Attempts to hydrolyze the natural products 2-6 yielded azulenes, mainly 7-acetyl-1,4-dimethylazulene [9].