Simultaneous structure–activity studies and arming of natural products by C–H amination reveal cellular targets of eupalmerin acetate
作者:Jing Li、Justin S. Cisar、Cong-Ying Zhou、Brunilda Vera、Howard Williams、Abimael D. Rodríguez、Benjamin F. Cravatt、Daniel Romo
DOI:10.1038/nchem.1653
日期:2013.6
can functionalize unique sites within these complex structures is highly desirable. Here, we describe the use of rhodium(II)-catalysed C–H amination reactions developed by Du Bois to carry out simultaneous structure–activity relationship studies and arming (alkynylation) of natural products at ‘unfunctionalized’ positions. Allylic and benzylic C–H bonds in the natural products undergo amination while
天然产品在发现有用的生物活性方面有着悠久的历史和持久的潜力。为了充分利用这一点,非常需要开发能够使这些复杂结构中的独特位点功能化的化学方法。在这里,我们描述了铑(II)-催化的 C-H 胺化反应由 Du Bois 开发,用于同时进行构效关系研究和天然产物在“未官能化”位置的武装(炔基化)。天然产物中的烯丙基和苄基 C-H 键进行胺化,而烯烃进行氮丙啶化,含叔胺的天然产物通过 C-H 胺化-氧化序列转化为脒或通过不寻常的 N-胺化转化为氨基磺酸肼两性离子。炔基化衍生物可用于转化为可用于作用机制研究的细胞探针。化学和位点选择性研究了一个多样化的天然产物库。对于其中之一——海洋衍生的抗癌二萜,
Synthesis of cytotoxic cembranolide analogues via acid-induced opening of oxiranes
作者:Abimael D. Rodrı́guez、Ivette C. Piña、Ana L. Acosta、Charles L. Barnes
DOI:10.1016/s0040-4020(00)01000-0
日期:2001.1
A large series of analogues of Eunicea cembranolides 1–3 were synthesized with the purpose of evaluating their cytotoxicity against 60 human cancer cell-lines. Most of the analogues were as active as the lead compounds and a few displayed increased cytotoxicity. Their syntheses were based on the specific reactivity and stereochemistry of the epoxide substructure and involved highly regio- and diastereoselective
Synthesis of Analogues of <i>Eunicea</i> γ-Cembranolides Containing Cyclic Ethers via Saponification
作者:Abimael D. Rodríguez、Ivette C. Piña、Ana L. Acosta、Catherine Ramírez、Javier J. Soto
DOI:10.1021/jo001025j
日期:2001.2.1
A method for the synthesis of derivatives of the lead structures euniolide (1), 12,13-bisepieupalmerin (2), and eupalmerin acetate (3) containing tetrahydrofuran and tetrahydropyran ring systems was developed on the basis of alkali-induced intramolecular oxacyclizations. Representatives of the new analogues were submitted to the in vitro antitumor cell-line-screening program of the National Cancer