Concise and direct construction of cis-pyrano[4,3-b]pyran-5-one skeleton from glucal derivatives: synthesis of ent-4-deoxy-2,3-di-epi-dinemasone BC
作者:Xiaochao Xue、Wei Li、Zhaojun Yin、Xiangbao Meng、Zhongjun Li
DOI:10.1016/j.tetlet.2015.07.055
日期:2015.9
(−)-Dinemasones B and C were isolated from a culture of the endophytic fungus Dinemasporium strigosum and had shown attractive antimicrobial activities in vitro. Described herein is the concise synthesis of their analogue, ent-4-deoxy-2,3-di-epi-dinemasone BC, from glucal derivatives, including C-glycoside and 3-deoxy-glucal, and the strategies proceeded in 7 steps in 13% overall yield and in 9 steps
(-)-地孕酮B和C是从内生真菌Dinemasporium strigosum的培养物中分离得到的,并在体外显示出有吸引力的抗菌活性。本文描述了由包括C-糖苷和3-deoxy-glucal在内的葡糖衍生物对它们的类似物ent -4-deoxy-2,3- di - epi - dinemasone BC的简明合成,该策略分7步进行。总产率分别为13%和9个步骤,总产率为17%。