Gifted with novel chemical features and extraordinary biological activity, sceptrin has remained a prominent unanswered synthetic challenge since its characterization in 1981 by Faulkner and Clardy. A concise and practical solution to the myriad of chemical challenges posed by sceptrin is reported in this Communication. Thus, through a sequence involving rearrangement of an oxaquadricyclane, a new method for chemo- and regioselective halogenation, a mild sequence for 2-aminoimidazole formation, and careful synthetic choreography, (+/-)-sceptrin is obtained in a minimum of steps and in 24% overall yield from dimethyl acetylenedicarboxylate without a single use of chromatography.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1021/ja049648s | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Interventions to Reduce Mental Health Stigma in Young People: A Systematic Review and Meta-Analysis.
JAMA Netw Open
January 2025
Millennium Nucleus to Improve the Mental Health of Adolescents and Youths (IMHAY), Santiago, Chile.
Importance: Mental health stigma is a considerable barrier to help-seeking among young people.
Objective: To systematically review and meta-analyze randomized clinical trials (RCTs) of interventions aimed at reducing mental health stigma in young people.
Data Sources: Comprehensive searches were conducted in the CENTRAL, CINAHL, Embase, PubMed, and PsycINFO databases from inception to February 27, 2024.
Restorative Neurostimulation Therapy Compared to Optimal Medical Management: A Randomized Evaluation (RESTORE) for the Treatment of Chronic Mechanical Low Back Pain due to Multifidus Dysfunction.
Pain Ther
January 2025
Robert Wood Johnson University Hospital/Rutgers Medical School, New Brunswick, NJ, USA.
Introduction: Many interventional strategies are commonly used to treat chronic low back pain (CLBP), though few are specifically intended to target the distinct underlying pathomechanisms causing low back pain. Restorative neurostimulation has been suggested as a specific treatment for mechanical CLBP resulting from multifidus dysfunction. In this randomized controlled trial, we report outcomes from a cohort of patients with CLBP associated with multifidus dysfunction treated with restorative neurostimulation compared to those randomized to a control group receiving optimal medical management (OMM) over 1 year.
View Article and Find Full Text PDFLipid Changes 10-15 Years After Roux-en-Y Gastric Bypass: A Prospective Observational Study.
Obes Surg
January 2025
Medical Department, Ålesund Hospital, Møre Og Romsdal Hospital Trust, 6026, Ålesund, Norway.
Background: Several studies have documented a beneficial short-term effect on lipid profile after Roux-en-Y gastric bypass (RYGB), but there is limited data on long-term changes.
Objectives: To describe long-term (> 10 years) changes in lipid profile after RYGB and to explore the relationship of lipid changes to changes in weight and baseline and demographic parameters.
Methods: The BAROBS study is a prospective observational study post RYGB conducted at three different hospitals.
Horizontal and longitudinal targeted metabolomics in healthy pregnancy and gestational diabetes mellitus.
Acta Diabetol
January 2025
Department of Obstetrics, Women's Hospital, School of Medicine, Zhejiang University, Hangzhou, China.
Objective: The objective is to investigate the differences in urinary organic acid (OA) profiles and metabolism between healthy control (HC) pregnant women and those with gestational diabetes mellitus (GDM) during the second trimester and third trimester of pregnancy.
Methods: A total of 66 HC pregnant women and 32 pregnant women with GDM were assessed for 107 hydrophilic metabolites in urine samples collected during the second and third trimester of pregnancy using tandem mass spectrometry. The urine OA profiles for each group were obtained, and metabolomic analysis and discussion were conducted.
Impact of Cement Distribution on the Efficacy of Percutaneous Vertebral Augmentation for Osteoporotic Fractures: Assessment with an MRI-Based Reference Marker.
J Bone Joint Surg Am
January 2025
Department of Orthopaedics, BenQ Medical Center, The Affiliated BenQ Hospital of Nanjing Medical University, Nanjing, Jiangsu, People's Republic of China.
Background: No studies have evaluated the impact of the cement distribution as classified on the basis of the fracture bone marrow edema area (FBMEA) in magnetic resonance imaging (MRI) on the efficacy of percutaneous vertebral augmentation (PVA) for acute osteoporotic vertebral fractures.
Methods: The clinical data of patients with acute, painful, single-level thoracolumbar osteoporotic fractures were retrospectively analyzed. The bone cement distribution on the postoperative radiograph was divided into 4 types according to the distribution of the FBMEA on the preoperative MRI.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!