Delaware Agricultural Experiment Station Department of Entomology & Applied Ecology College of Agricultural Sciences, University of Delaware, 19717-1303, Newark, Delaware.
J Chem Ecol. 1993 Jan;19(1):29-37. doi: 10.1007/BF00987468.
In addition to cucurbitacins E andI, cucurbitacins D,1, 3-epi-isocucurbitacin D,2, and B,3, were isolated from the fruits ofCucurbita texana and structurally identified by UV, IR,(1)H NMR,(13)C NMR, and MS, and 2-O-Β-glucopyranosylcucurbitacin I was identified. These compounds have not been reported previously as constituents of this species. The isolation of 3-epi-isocucurbitacin D2 together with normal cucurbitacins suggests that isocucurbitacins occur naturally. Evidence is also discussed that isocucurbitacins are biosynthesized one step ahead of normal cucurbitacin.
除了葫芦素 E 和 I，葫芦素 D、1、3-表异构葫芦素 D、2 和 B、3 也从南瓜属的果实中分离出来，并通过 UV、IR、(1)H NMR、(13)C NMR 和 MS 进行了结构鉴定，并鉴定出 2-O-β-葡萄糖吡喃苷葫芦素 I。这些化合物以前尚未被报道为本种的成分。3-表异构葫芦素 D2 与正常葫芦素的同时分离表明异葫芦素是天然存在的。还讨论了异葫芦素在正常葫芦素之前一步生物合成的证据。
