Chiral synthesis of polyketide-derived natural products. 10. Stereoselective synthesis of pikronolide, the aglycon of the 14-membered ring macrolide pikromycin, from D-glucose. Role of MPM and DMPM protection

1986 ◽  
Vol 108 (15) ◽  
pp. 4645-4647 ◽  
Author(s):  
Noriyuki. Nakajima ◽  
Tatsuo. Hamada ◽  
Tatsuyoshi. Tanaka ◽  
Yuji. Oikawa ◽  
Osamu. Yonemitsu
Keyword(s):  
Natural Products ◽  
Stereoselective Synthesis ◽  
Membered Ring ◽  
Chiral Synthesis

Pharmacologic Role of Vitamin D Natural Products

2014 ◽  
Vol 12 (2) ◽  
pp. 278-285 ◽  
Author(s):  
Pablo Urena-Torres ◽  
Jean Souberbielle
Keyword(s):  
Vitamin D ◽  
Natural Products

scholarly journals Oxidation of Terpenoids to Achieve High-Value Flavor and Fragrances—Questioning Microalgae Oxidative Capabilities in the Biotransformation of the Sesquiterpene Valencene and of Selected Natural Apocarotenoids

Chemistry ◽  
2021 ◽  
Vol 3 (3) ◽  
pp. 821-830
Author(s):  
Davide De Simeis ◽  
Stefano Serra ◽  
Alessandro Di Fonzo ◽  
Francesco Secundo
Keyword(s):  
Experimental Data ◽  
Natural Products ◽  
Aqueous Medium ◽  
Photochemical Reaction ◽  
Substrate Oxidation ◽  
Market Size ◽  
Chlorella Sp ◽  
General Opinion ◽  
Natural Way

Natural flavor and fragrance market size is expected to grow steadily due to the rising consumer demand of natural ingredients. This market request is guided by the general opinion that the production of natural compounds leads to a reduction of pollution, with inherent advantages for the environment and people’s health. The biotransformation reactions have gained high relevance in the production of natural products. In this context, few pieces of research have described the role of microalgae in the oxidation of terpenoids. In this present study, we questioned the role of microalgal based oxidation in the synthesis of high-value flavors and fragrances. This study investigated the role of three different microalgae strains, Chlorella sp. (211.8b and 211.8p) and Chlorococcum sp. (JB3), in the oxidation of different terpenoid substrates: α-ionone, β-ionone, theaspirane and valencene. Unfortunately, the experimental data showed that the microalgal strains used are not responsible for the substrate oxidation. In fact, our experiments demonstrate that the transformation of the four starting compounds is a photochemical reaction that involves the oxygen as oxidant. Even though these findings cast a shadow on the use of these microorganisms for an industrial purpose, they open a new possible strategy to easily obtain nootkatone in a natural way by just using an aqueous medium, oxygen and light.

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