A convergent total synthesis of (-)-nahuoic acid C(B) (3), a novel cis-decalin polyketide, has been achieved. Key synthetic transformations include Type II Anion Relay Chemistry (ARC) to construct the polyol chain, a Ti-catalyzed asymmetric Diels-Alder reaction to generate the cis-decalin skeleton, and a late-stage large fragment union exploiting a Micalizio alkoxide-directed alkyne-alkene coupling tactic.
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http://dx.doi.org/10.1021/jacs.7b08683 | DOI Listing |
JAMA Netw Open
January 2025
Department of Nutritional Sciences, University of Toronto, Toronto, Ontario, Canada.
Importance: Ultraprocessed foods (UPF), characterized as shelf-stable but nutritionally imbalanced foods, pose a public health crisis worldwide. In adults, UPF consumption is associated with increased obesity risk, but findings among children are inconsistent.
Objectives: To examine the associations among UPF intake, anthropometric adiposity indicators, and obesity status in Canadian children.
Crit Care Explor
February 2025
Oxford Vaccine Group, Department of Paediatrics, University of Oxford, Oxford, United Kingdom.
Objectives: Sepsis is a life-threatening medical emergency, with a profound healthcare burden globally. Its pathophysiology is complex, heterogeneous and temporally dynamic, making diagnosis challenging. Medical management is predicated on early diagnosis and timely intervention.
View Article and Find Full Text PDFArch Osteoporos
January 2025
Division of Endocrinology & Metabolism, Department of Internal Medicine, Yeouido St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
Unlabelled: This study compared denosumab and zoledronic acid for treating osteoporosis in drug-naïve postmenopausal Korean women. Over 3 years, both drugs significantly increased bone mineral density. However, denosumab also improved fat-free mass, suggesting it may be a better initial treatment for osteoporosis with low muscle mass, assuming all other conditions remain constant.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
January 2025
Kunming Institute of Botany Chinese Academy of Sciences, State Key Laboratory of Phytochemistry and Plant Resources in West China, 132 Lanhei Road, 650201, Kunming, CHINA.
A polysaccharide APS-1 II from a medicinal plant Angelica sinensis represents an interesting therapeutic agent against leukemia. However, the synthetic accessibility of the highly branched and complex APS-1 II polysaccharide with multiple 1, 2-cis-glycosidic linkages remains a difficult task, impeding the in-depth structure-activity relationship biological studies and the development of carbohydrates-based therapeutics against leukemia. Here, we report the first chemical synthesis of tridecasaccharide repeating unit together with shorter sequences 4-mer, 6-mer and 9-mer from APS-1 II polysaccharide via one-pot orthogonal glycosylation strategy based on glycosyl ortho-(1-phenylvinyl)benzoates, which precluded the potential issues such as aglycone transfer associated with one-pot assembly with thioglycosides.
View Article and Find Full Text PDFNephrology (Carlton)
February 2025
Internal Medicine Department, Shenzhen Bao'an Authentic Tcm Therapy Hospital, Shenzhen, China.
Aim: Type 2 diabetes mellitus (T2DM) is a metabolic syndrome characterised by absolute or relative insufficiency of insulin secretion. The alkaloids from Rhizoma coptidis have potential hypoglycemic effects. Epiberberine (EPI), a protoberberine alkaloid extracted from Rhizome coptidis, has been found to regulate lipid metabolism.
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