Herein, we report a novel strategy toward galanthamine and lycoramine. The concise synthesis was enabled by a Rh-catalyzed gram-scale C-C activation for the tetracyclic carbon framework and a regioselective Pd-catalyzed C-H activation for double-bond introduction. An aqueous-phase Beckmann rearrangement was performed for nitrogen atom insertion. Galanthamine and lycoramine were completed in 11 and 10 steps, respectively.
Download full-text PDF |
Source |
---|---|
http://dx.doi.org/10.1021/acs.orglett.9b04337 | DOI Listing |
Int J Mol Sci
February 2023
Key Laboratory of Plant Resource Conservation and Germplasm Innovation in Mountainous Region (Ministry of Education), Collaborative Innovation Center for Mountain Ecology & Agro-Bioengineering (CICMEAB), Institute of Agro-Bioengineering, College of Life Sciences, Guizhou University, Guiyang 550025, China.
Alkaloids are a class of nitrogen-containing alkaline organic compounds found in nature, with significant biological activity, and are also important active ingredients in Chinese herbal medicine. Amaryllidaceae plants are rich in alkaloids, among which galanthamine, lycorine, and lycoramine are representative. Since the difficulty and high cost of synthesizing alkaloids have been the major obstacles in industrial production, particularly the molecular mechanism underlying alkaloid biosynthesis is largely unknown.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
April 2023
Department of Chemistry, Zhejiang University, Hangzhou, 310027, China.
Herein, a general strategy for chemo- and regioselective 1,2-reduction of chromium-bound arenes was developed, thus providing rapid access to 1,3-cyclohexadienes. Selective arene activation via π-complexation along with the use of mild hydride Ph SiH can overcome the inherently low reactivity of arene π-bonds while tolerating various reduction-sensitive functional groups. Its versatility further enables a regiodivergent deuteration.
View Article and Find Full Text PDFSci Rep
August 2022
Department of Plant Breeding, Physiology and Seed Science, University of Agriculture in Krakow, Łobzowska 24, 31-140, Krakow, Poland.
Leucojum aestivum is known for its ability to biosynthesize alkaloids with therapeutic properties, among which galanthamine used for the treatment of Alzheimer's disease. New sources of this alkaloid are still being explored. In this study, a novel strain PLV of endophytic bacterium Paenibacillus lautus was isolated from in vitro L.
View Article and Find Full Text PDFPlants (Basel)
July 2022
Departament de Biologia, Sanitat i Medi Ambient, Facultat de Farmàcia i Ciències de l'Alimentació, Universitat de Barcelona, Av. Joan XXIII #27-31, 08028 Barcelona, Spain.
Natural products have always played a significant role in the search for new drugs. One of the most relevant alkaloid-containing plant groups is the Amaryllidaceae family, a source of exclusive structures with a wide variety of pharmacological activities. The aim of this work was to determine the alkaloid composition and biological potential of an extract from the bulbs of an endemic Peruvian Amaryllidaceae species (Ker Gawl.
View Article and Find Full Text PDFJ Org Chem
June 2022
Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, Kalyani, Nadia 741 246, West Bengal, India.
A concise asymmetric total synthesis of naturally occurring alkaloids sharing dihydrobenzofuran scaffolds, (-)-galanthamine (), (-)-lycoramine (), (-)-narwedine (), and (-)-lycoraminone (), is reported. Orthoester Johnson-Claisen rearrangement of allyl alcohol (+)- (98% ee) in diisopropylethylamine furnished enantioenriched cyclohexene (+)- (97.4% ee) with a quaternary stereogenic center.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!