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Toward the Synthesis of Strychnos Alkaloids: Effective Construction of Fused Cyclohexane and Pyrrolidine Portion of the Strychnos Skeleton via Domino Intermolecular and Intramolecular S2 Cyclization.
Chem Pharm Bull (Tokyo)
January 2025
Graduate School of Integrated Basic Sciences, Nihon University, 3-25-40 Sakurajosui, Setagaya-ku, Tokyo 156-8550, Japan.
A method for preparing the fused cyclohexane and pyrrolidine portion of the strychnos skeleton has been developed using domino intermolecular and intramolecular S2 cyclization. Using this method, the formation of pyrrolidine proceeded smoothly with good yield without the E2 elimination product. This reaction condition is effective for synthesizing the fused cyclohexane and pyrrolidine portion of the strychnos skeleton.
View Article and Find Full Text PDFStructural Categorization of Adenine, Guanine, and Xanthine Derivatives Using Matrix-Assisted Laser Desorption/Ionization Mass Spectrometry with 5-Nitrosalicylic Acid and 1,5-Diaminonaphtalene.
J Am Soc Mass Spectrom
February 2025
Suntory Institute for Bioorganic Research, Suntory Foundation for Life Sciences, 8-1-1 Seikadai, Seika-Cho, Soraku-Gun, Kyoto 619-0284 Japan.
In this study, we analyzed purine derivatives using multimatrix variation matrix-assisted laser desorption ionization mass spectrometry (MALDI MS) with α-cyano-4-hydroxycinnamic acid (CHCA), 1,5-diaminonaphtalene (DAN), 5-formylsalicylic acid (FSA), and 5-nitrosalicylic acid (NSA) as matrices. Further, we focused on the abstraction/attachment of hydrogen from/to analytes and detected [M - H], [M + 2H] and/or [M + 3H] in MALDI MS spectra of compounds containing nitrogen and/or carbonyl oxygen. Although [M - H] generation of purine compounds in MALDI MS with conventional matrices was challenging, NSA-MALDI MS effectively yielded the [M - H]species of purine derivatives compared with CHCA, FSA, and DAN, and the [M - H]/[M + H] ratios reflected their structures, such as the substituting groups and positions.
View Article and Find Full Text PDF[A Case of Laparoscopic Surgery for Malignant Lymphoma of the Small Intestine with Bowel Obstruction].
Gan To Kagaku Ryoho
October 2024
Dept. of Surgery, Noshiro Yamamoto Medical Association Hospital.
An 80-year-old woman presented to our hospital complaining of nausea and abdominal distention. An abdominal computed tomography scan revealed wall thickening of the small intestine, a dilated oral intestinal tract, swollen intra-abdominal lymph nodes, and splenomegaly. Moreover, the soluble interleukin-2 receptor level was increased at 2,120 U/mL.
View Article and Find Full Text PDFGalantamine for dementia due to Alzheimer's disease and mild cognitive impairment.
Cochrane Database Syst Rev
November 2024
Macquarie Medical School, Macquarie University, Sydney, Australia.
Background: Dementia leads to progressive cognitive decline, and represents a significant health and societal burden. Its prevalence is growing, with Alzheimer's disease as the leading cause. There is no cure for Alzheimer's disease, but there are regulatory-approved pharmacological interventions, such as galantamine, for symptomatic relief.
View Article and Find Full Text PDFAnti-aging and immunomodulatory role of caffeine in larvae.
Narra J
August 2024
Faculty of Pharmacy, Universitas Hasanuddin, Makassar, Indonesia.
Drug repurposing is a promising approach to identify new pharmacological indications for drugs that have already been established. However, there is still a limitation in the availability of a high-throughput preclinical system that is suitable for screening and investigating new pharmacological indications. The aim of this study was to introduce the application of larvae as an platform to screen drug candidates with anti-aging and immunomodulatory activities.
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