Bismurrayaquinone A: Synthesis, chromatographic enantiomer resolution, and stereoanalysis by computational and experimental CD Investigations
摘要:
The first total synthesis of a naturally occurring dimeric carbazole alkaloid, bismurrayaquinone A (4), is described, by oxidation of dimeric O-demethylmurrayafoline A, a still hypothetic natural product recently synthesized. By chromatography on a chiral phase, the two atropoenantiomers were separated. The absolute configurations of these two rotational isomers were elucidated by comparison of their calculated spectra with those measured experimentally.
Palladium‐Catalyzed Regioselective Synthesis of 1‐Hydroxycarbazoles Under Aerobic Conditions
作者:So Won Youn、Young Ho Kim、Yoon Hyung Jo
DOI:10.1002/adsc.201801265
日期:2019.2
A palladium‐catalyzed aerobic C−H amidation of N‐Ts‐2‐amino‐3′‐hydroxylbiaryls has been developed to afford a diverse range of 1‐hydroxycarbazoles with high regioselectivity and efficiency. This protocol benefits from operational simplicity, robustness, and sustainability with the use of ambient air as the sole terminal oxidant. Further elaboration of the products obtained from this process provides
Antiplasmodial Activity of Mono- and Dimeric Carbazoles
作者:Gerhard Bringmann、Alfons Ledermann、Jörg Holenz、Muh-Tsuen Kao、Ulrich Busse、Howard Wu、Guido François
DOI:10.1055/s-2006-957366
日期:1998.2
A series of mono-and dimeric natural and structurally modified carbazoles has been tested for activity against Plasmodium falciparum. One of the monomers, the synthetic compound 1,4-diacetoxy-3-methylcarbazole (17), displays the highest activity, with an IC50 value of 1.79 µg/ml. It is distinctly more active than the as yet best natural compound, 1-hydroxy-3-methylcarbazole (4) (4).
The first total synthesis of a naturally occurring dimeric carbazole alkaloid, bismurrayaquinone A (4), is described, by oxidation of dimeric O-demethylmurrayafoline A, a still hypothetic natural product recently synthesized. By chromatography on a chiral phase, the two atropoenantiomers were separated. The absolute configurations of these two rotational isomers were elucidated by comparison of their calculated spectra with those measured experimentally.
Enantioselective Total Synthesis and Studies into the Configurational Stability of Bismurrayaquinone A
作者:Leah C. Konkol、Fenghai Guo、Amy A. Sarjeant、Regan J. Thomson
DOI:10.1002/anie.201104726
日期:2011.10.10
concise strategy of the first enantioselective total synthesis of bismurrayaquinone A utilized traceless stereochemical exchange to form an enantioenriched biphenyl core that was elaborated in a bidirectional manner to the natural product. Observed racemization on an unsuccessful initial route prompted studies into the configurationalstability of bismurrayaquinone A and related biquinones.
旋转丢失:双Murrayaquinone A 的第一个对映选择性全合成的简明策略利用无痕立体化学交换形成对映体富集的联苯核心,并以双向方式与天然产物进行精制。在一条不成功的初始路线上观察到的外消旋作用促使人们对双醌 A 和相关联醌的构型稳定性进行了研究。