The asymmetric total synthesis of five biologically significant polycyclic polyprenylated acylphloroglucinols (PPAPs), including garcinol and cambogin, was achieved through a highly diastereoselective and stereodivergent strategy. Along the way, an efficient cascade Dieckmann cyclization was employed to construct the bicyclo[3.3.1]nonane core in one step. The synthesis provided a general approach toward
Total Synthesis and Absolute Configuration Assignment of MRSA Active Garcinol and Isogarcinol
作者:Cecilia Socolsky、Bernd Plietker
DOI:10.1002/chem.201406077
日期:2015.2.9
A short total synthesis of (±)‐garcinol and (±)‐isogarcinol, two endo‐type B PPAPs with reported activity against methiciline resistant Staphylococcus aureus (MRSA), is presented. The separation of framework‐constructing from framework‐decorating steps and the application of two highly regio‐ and stereoselective Pd‐catalysed allylations, that is, the Pd‐catalysed decarboxylative Tsuji–Trost allylation
Four known natural compounds i.e., (-) isogarcinol, (+) 7-epigarcinol, stigmasterol and b-sitosterol-3-O-b-D-glucoside were isolated from the stem bark of Garcinia punctata oliv. From (-) isogarcinol, two new hemisynthesis O-allylated benzophenones were synthesized using allylbromide in the presence of potassium carbonate in anhydrous acetone. The structural elucidation of all the compounds was done by mass spectrometry, IR, 1D- and 2D-NMR analysis and also by comparison with previous reports. This is the first study to report on the one step allylation of the natural (-) isogarcinol using the base catalysis conditions.
An expanding agent for hematopoietic stem cells and/or hematopoietic progenitor cells useful as a therapy for various hematopoietic diseases and useful for improvement in the efficiency of gene transfer into hematopoietic stem cells for gene therapy is provided.
A method of producing hematopoietic stem cells and/or hematopoietic progenitor cells, which comprises expanding hematopoietic stem cells by culturing hematopoietic stem cells ex vivo in the presence of a compound represented by the formula following (I), a tautomer or pharmaceutically acceptable salt of the compound or a solvate thereof (wherein R1 to R6 are as defined in the description).
Guttiferone F, a natural polyprenylated polycyclic acylphloroglucinol, was originally assigned as the 30-epimer of garcinol by NMR data analyses. Conversion of guttiferone F in the presence of acid afforded its cyclized form (2a), which was previously assigned as 30-epi-cambogin. However, the absolute configurations of guttiferone F and 2a have not been determined. Reinvestigation of the structures
Guttiferone F 是一种天然的聚异戊二烯化多环酰基间苯三酚,最初通过 NMR 数据分析被指定为 garcinol 的 30-差向异构体。在酸的存在下,guttiferone F 的转化提供了其环化形式 ( 2a ),其先前被指定为 30- epi- cambogin。然而,guttiferone F 和2a的绝对构型尚未确定。使用 X 射线和 NMR 数据分析和化学转化对这两种化合物的结构进行重新研究后,发现 Gattiferone F 和2a 中C-30 绝对构型的原始分配应该被颠倒。Guttiferone F 确实是 garcinol,而2a之前被鉴定为 30- epi-cambogin,是cambogin。