Naturalproductman’s Blog

Hey, is that a natural product?!

Schönecker with a C19-iminopyridine

Posted by naturalproductman on July 19, 2022

The Schönecker oxidation popularized in the total synthesis of many natural products involves a copper mediated oxidation of a C17-iminopyridine steroid derivative to yield a 12beta-hydroxy steroid product. Here, a C19-iminopyridine steroid derivative was used to yield some wild chemistry: C1beta-hydroxylation/19-peroxidation and a C5-C6 olefin difunctionalization.

Steroids paper

Posted in Uncategorized | Leave a Comment »

C2-Olefinated Dihydroartemisinic Acid Analogue Aromatizes

Posted by naturalproductman on March 31, 2022

Dihydroartemisinic acid is the biosynthetic precursor to artemisinin, an endoperoxide containing plant natural product used to treat malaria. The research team of Francis Yoshimoto at UTSA and collaborators: Catherine Wakeman’s lab from Texas Tech University and Luis Martinez’s lab from the University of Florida, showed that an olefinated version of dihydroartemisinic acid aromatizes instead of forming an endoperoxide ring revealing new insights towards endoperoxide formation. They applied this knowledge to the biosynthesis of the aromatic ring in serrulatene. Antimicrobial activities were measured against Staphylococcus aureus and Cryptococcus neoformans with some of their synthesized compounds having MIC values of 12.5 micrograms/mL.

Journal of Natural Products paper

Posted in Antibiotics, Endoperoxide | Leave a Comment »

Pressures of Academia

Posted by naturalproductman on October 4, 2021

We always hear about mental health concerns for our students, but here’s an interesting article reminding us about the mental health of being a faculty.

eLife Sciences paper

Posted in Mentoring | Leave a Comment »

Mechanistic insights towards endoperoxide formation of artemisinin

Posted by naturalproductman on June 17, 2021

Artemisinin, one of the topics of the Nobel Prizes in Medicine in 2015, and its derivatives have been used to treat malaria. A new study published in the Journal of Natural Products finds that the endoperoxide formation of artemisinin from dihydroartemisinic acid, its biosynthetic precursor, undergoes a mixed mechanism. The study, from the lab of Francis Yoshimoto at UTSA, used regioselectively deuterated dihydroartemisinic acid isotopologues to measure competitive intermolecular kinetic isotope effects in the formation of artemisinin. The supporting information file is over 500 pages!

Cool!


Journal of Natural Products
paper

Posted in Antimalarial, Cyclic Peroxides, Diseases, Isotope effects, Malaria, Mass Spectrometry, Mechanistic, Peroxides, Terpenes | Leave a Comment »

Update – SARS CoV-2 Mutants

Posted by naturalproductman on May 22, 2021

Here’s an update related to SARS CoV-2 mutants that are more infective than the original strain. The basis behind more infective strains of SARS CoV-2 seems to be the spike protein, which is the protein the virus uses to enter the human cells.

The Protein Journal

Posted in Uncategorized | Leave a Comment »

SARS CoV-2 update

Posted by naturalproductman on February 26, 2021

Here’s an update on a biochemical perspective of SARS CoV-2 proteins (especially the spike protein).

The Protein Journal

Posted in Anti-viral | Leave a Comment »

Tryptophan labeling

Posted by naturalproductman on September 6, 2020

Michael Taylor and co-workers from the University of Wyoming reported in JACS on a method to label tryptophan residues using an N-carbamoyl pyridinium salt and light.

JACS paper

Posted in Light Mediated, Methodology, Proteins | Leave a Comment »

Zephycarinatines syntheses

Posted by naturalproductman on August 17, 2020

Hiroaki Ohno and co-workers at Kyoto University have reported in ACIE on the synthesis of zephycarinatines.

 

ACIE paper

Posted in Alkaloids, Light Mediated, Total Synthesis | Leave a Comment »

(−)‐Conidiogenone B, (−)‐Conidiogenone, and (−)‐Conidiogenol syntheses

Posted by naturalproductman on August 17, 2020

Hongbin Zhai and co-workers from Peking University have reported in ACIE on the synthesis of conidiogenone B, conidiogenone and conidiogenol.

 

ACIE paper

Posted in Diterpene, Total Synthesis | Leave a Comment »

Disciformycin B synthesis

Posted by naturalproductman on August 17, 2020

Karl-Heinz Altmann and co-worker from ETH Zurich have reported in ACIE on the synthesis of disciformycin B.

 

ACIE paper

Posted in Antibiotics, Total Synthesis | Leave a Comment »