Related Experiment Video
Updated: Nov 8, 2025
![Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F60786.jpg&w=3840&q=50)
Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions
Published on: July 17, 2020
Four new phenanthrene derivatives from Bulbophyllum retusiusculum
Yun-Shan Fang1, Ming-Hui Yang2, Jia-Peng Wang3
1School of Chemistry and Chemical Engineering, Kunming University, Kunming 650214, China.
Abstract:
Three new dihydrophenanthrenes, retusiusine D (1), retusiusine E (2), retusiusine F (3), and a new phenanthrene retusiusine G (4), together with two known dihydrophenanthrenes 4,7-dihydroxy-2,3-methylenedioxy-9,10-dihydrophenanthrene (5) and epemeranthol-A (6) were isolated from the tubers of Bulbophyllum retusiusculum. Their structures were established on the basis of extensive spectroscopic analyses. Compounds 1 and 2 exhibited potent cytotoxic activities against SMMC-7721 and weak cytotoxic activities against HL-60. Compound 4 showed moderate cytotoxic activity against SMMC-7721 and MCF-7.
More Related Videos
07:30A Direct, Regioselective and Atom-Economical Synthesis of 3-Aroyl-N-hydroxy-5-nitroindoles by Cycloaddition of 4-Nitronitrosobenzene with Alkynones
Published on: January 21, 2020
07:16Preparation of Gynura bicolor DC samples for High-Resolution Tandem Mass Spectrometry
Published on: February 2, 2024
Related Concept Videos
Aromatic Compounds: Overview
In 1825, Faraday isolated...
Nomenclature of Aromatic Compounds with a Single Substituent
Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism
Five-Membered Heterocyclic Aromatic Compounds: Overview
Hydrolysis of Chlorobenzene to Phenol: Dow Process
Electrophilic Aromatic Substitution: Nitration of Benzene