The present invention relates compounds of formula (I)
wherein A and R
1
are as defined in the specification, pharmaceutical compositions comprising such compounds, and methods of treating conditions and disorders using such compounds and pharmaceutical compositions.
Disclosed herein are compounds of formula (I)
wherein Ring A and R
1
are as defined in the specification. Pharmaceutical compositions comprising such compounds, and methods for treating conditions and disorders using such compounds and pharmaceutical compositions are also disclosed.
Gold-Catalyzed Formation of Oxonium Ions from Enynes and Their Intra- and Intermolecular Trapping with Allylsilanes
作者:Jingwei Li、Xiaoguang Liu、Daesung Lee
DOI:10.1021/ol203206k
日期:2012.1.6
Gold-catalyzed ringclosure of 1,5-enyne containing a silyl ether at the allylic position induces a skeletal rearrangement to form an oxonium intermediate, which then undergoes a smooth allylation in both an intra- and intermolecular manner. In the intramolecularallyltransfer, the additive alcohol becomes positioned on the silicon of the silyl ether by forming a new Si–OR bond, whereas, in the intermolecular
Asymmetric reduction of ketones by Geotrichum candidum in the presence of AmberliteTM XAD, a solid organic solvent
作者:Kaoru Nakamura、Mikio Fujii、Yoshiteru Ida
DOI:10.1039/b005204n
日期:——
A hydrophobic polymer, Amberlite™ XAD, was used as material to control the stereochemical course of microbial reductions. In the presence of XAD, simple aliphatic and aromatic ketones were reduced to the corresponding (S)-alcohols in excellent enantiomeric excess (ee) while low enantioselectivities were observed in the absence of the polymer.
diverse compound libraries. In response to this, an efficient solid-phase approach has been developed and successfully applied to the totalsynthesis of jasplakinolide and chondramide C and diverse analogues. The key macrocylization step was realized using ruthenium-catalyzed ring-closing metathesis (RCM) that in the course of a library synthesis produced discernible trends in metathesis reactivity and
肌动蛋白在调节真核细胞维持和运动中发挥的基本作用使其成为小分子干预的主要目标。在这个领域,在过去的 25 年里出现了一类有效的细胞毒性环缩肽天然产物,以其独特的肌动蛋白稳定特性和复杂的肽-聚酮化合物混合结构刺激生物学和化学领域。尽管进行了大量研究,但这些次级代谢物活性的结构基础仍然难以捉摸,尤其是缺乏高分辨率结构数据和可靠的合成多种化合物库的途径。针对这一点,开发了一种有效的固相方法,并成功应用于茉莉花内酯和软骨酰胺 C 以及多种类似物的全合成。关键的大环化步骤是使用钌催化的闭环复分解 (RCM) 实现的,在文库合成过程中,复分解反应性和 E/Z 选择性产生了可辨别的趋势。优化后,RCM 步骤可以在温和的条件下运行,这一结果有望促进更广泛的用于结构功能研究的类似库的合成。对合成化合物的生长抑制作用进行了量化,并建立了结构-活性相关性,这似乎与来自天然产物的相关生物数据具有良好的一致性。通过