Organic Letters 2014-10-03

Sterhirsutins A and B, two new heterodimeric sesquiterpenes with a new skeleton from the culture of Stereum hirsutum collected in Tibet Plateau.

Qiu-Yue Qi, Li Bao, Jin-Wei Ren, Jun-Jie Han, Zong-Yao Zhang, Yi Li, Yi-Jian Yao, Rui Cao, Hong-Wei Liu

Index: Org. Lett. 16(19) , 5092-5, (2014)

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Abstract

Two new heterodimeric sesquiterpenes, sterhirsutins A (1) and B (2), and two new sesquiterpenes, hirsutic acids D-E (3 and 4), were identified from the culture of Stereum hirsutum. The absolute configurations in 1 and 2 were confirmed by single-crystal X-ray diffraction experiments and electronic circular dichroism (ECD) calculations. Compounds 1 and 2 are likely biosynthesized from a hirsutane-type sesquiterpene and α-humulene by a hetero-Diels-Alder cycloaddition. Compounds 1-4 showed cytotoxicity against K562 and HCT116 cell lines.