Pinacol Coupling Strategy for the Construction of the Bicyclo[6.4.1]tridecane Framework of Schiglautone A
作者:Bettina Werner、Markus Kalesse
DOI:10.1021/acs.orglett.7b00288
日期:2017.4.7
The synthesis of the tricyclic carbon framework of schiglautone A (1) is reported herein. The generation of the bicyclo[6.4.1]tridecane 19 was accomplished via a SmI2-mediated pinacol coupling of dialdehyde 18. The side chain in 18 was introduced using a selective 1,4-addition. A further key step of the synthesis was the homologation of a Wieland–Miescher ketone derivative to establish the 7-membered
Biomimetic Enantioselective Total Synthesis of (−)-Mycoleptodiscin A
作者:Dattatraya H. Dethe、Susanta Kumar Sau、Samarpita Mahapatra
DOI:10.1021/acs.orglett.6b03292
日期:2016.12.16
Biomimetic totalsynthesis of (-)-mycoleptodiscin A (1) was achieved starting from the enantiopure key intermediate, which was prepared by Friedel-Crafts reaction between 7-methoxyindole and chiral primary allylic alcohol. The crucial step in this synthesis was an intramolecular Friedel-Crafts reaction at C-4 of the indole derivative driven by the EDG/EWG within a compound that was rationally designed
Nature-inspired development of unnatural meroterpenoids as the non-toxic anti-colon cancer agents
作者:Md Ashraful Haque、Bethsebie L. Sailo、Ganesan Padmavathi、Ajaikumar B. Kunnumakkara、Chandan K. Jana
DOI:10.1016/j.ejmech.2018.08.088
日期:2018.12
effective against the human colon adenocarcinoma cells with IC50 concentrations of 7.5–20 μM. In this series, the carbotetracyclic catechol 4e (IC50 = 7.5 μM) and quinone 12 (IC50 = 8 μM) were found to be the most potent compounds having the IC50 of less than 10 μM with no cytotoxic effect on the normal cells. Downregulation of Cox-2 and survivin and cell cycle arrest eventually leading to apoptosis were
Enantioselective first total syntheses of the antiviral natural products xiamycins D and E
作者:Dattatraya H. Dethe、Manmohan Shukla
DOI:10.1039/d1cc04739f
日期:——
The enantioselective first totalsyntheses of marine pentacyclic indolosesquiterpenoids xiamycins D (4) and E (5) have been described for the first time to the best of our knowledge. The synthetic approach was designed to feature functionalization of enantiopure Wieland–Miescher ketone, Michael addition followed by Heck-type annulation/aromatization, regioselective sp3(C–H) activation, benzylic oxidation
据我们所知,首次描述了海洋五环吲哚倍半萜类物质夏霉素 D ( 4 ) 和 E ( 5 )的对映选择性首次全合成。该合成方法旨在实现对映体纯 Wieland-Miescher 酮的功能化、迈克尔加成,然后是 Heck 型环化/芳构化、区域选择性 sp 3 (C-H) 活化、苄基氧化和非对映选择性还原。
Regiodivergent Remote Arylation of Cycloalkanols to Dysideanone′s Fused Carbotetracycles and Its Bridged Isomers
作者:Md Ashraful Haque、Chandan K. Jana
DOI:10.1002/chem.201703094
日期:2017.9.27
arylations across an all‐carbonquaternarycenter of cycloalkanols to access enantioenriched fused and bridged carbotetracycles are reported. The conformation of the carbocation guided either sequential stereospecific β‐C‐Me/γ‐C−H‐shifts or β‐C‐Me/γ′‐C−H‐shifts, providing fused carbotetracyclic analogs of dysideanone or bridged tetracycles, respectively. The reaction is highly stereoselective in building three