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Uncommon Diterpenoids with Diverse Frameworks from the South China Sea Sponge and Their Anti-inflammatory Activities.
J Org Chem
January 2025
School of Medicine, Shanghai University, 99 Shangda Road, BaoShan District, Shanghai 200444, China.
Uncommon diterpenoids with diverse frameworks, including one unexpected iodinated oxa-6/6/6/6-tetracyclic diterpene () and its monobrominated 6/6/6-tricyclic analogue () and one novel isodolastane-type diterpene featuring an unusual aromatic 5/7/6-tricyclic ring system () as well as a related known dolastane-type diterpenoid (), were isolated from the South China Sea sponge . Their structures, including absolute configurations, were established by extensive spectroscopic data analysis, X-ray diffraction analysis, and quantum mechanical-nuclear magnetic resonance and time-dependent density functional theory/electronic circular dichroism calculations. A plausible biosynthetic pathway of new compounds - was proposed.
View Article and Find Full Text PDFUnusual Manifestation of Vitamin K Deficiency, Nodular Purpura: A Case Series.
Indian Dermatol Online J
December 2024
Department of Dermatology, St John's Medical College, Bangalore, Karnataka, India.
Vitamin K deficiency is a common entity in infancy characterized by bleeding from various sites, intracranial bleeding being the most commonly reported feature. Nodular purpura is an uncommon manifestation of vitamin K deficiency in infancy with a few reported cases in literature. We present four cases of infants presenting with nodular purpura as a manifestation of late-onset vitamin K deficiency bleeding (VKDB).
View Article and Find Full Text PDFCase Report: Craniofacial deafness hand syndrome with unusual cardiovascular symptoms and lack of holistic care.
Front Genet
January 2025
Human Genetics Department, School of Medicine, Universidad San Francisco de Quito, Quito, Ecuador.
Background: Delays in diagnosing rare genetic disorders often arise due to limited awareness and systemic challenges in primary care. This case highlights the importance of a holistic approach to patient care, encompassing timely detection and comprehensive evaluation of clinical features.
Methods: We report the case of a 21-year-old Ecuadorian male with facial and hand dysmorphias, cardiomegaly, pulmonary hypertension, and patent ductus arteriosus (PDA).
Enantiocontrolled Cyclization to Form Chiral 7- and 8-Membered Rings Unified by the Same Catalyst Operating with Different Mechanisms.
J Am Chem Soc
January 2025
Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States.
Chiral medium-sized rings, albeit displaying attractive properties for drug development, suffer from numerous synthetic challenges due to difficult cyclization steps that must take place to form these unusually strained, atropisomeric rings from sterically crowded precursors. In fact, catalytic enantioselective cyclization methods for the formation of chiral seven-membered rings are unknown, and the corresponding eight-membered variants are also sparse. In this work, we present a substrate preorganization-based, enantioselective, organocatalytic strategy to construct seven- and eight-membered rings featuring chirality that is intrinsic to the ring in the absence of singular stereogenic atoms or single bond axes of chirality.
View Article and Find Full Text PDFAngiomatoid fibrous histiocytoma with EWSR1-CREB1 gene fusion occurs in lungs and ribs with systemic multiple metastases: a case report and review of the literature.
Front Oncol
January 2025
Department of Pathology, The First Affiliated Hospital of Dali University, Dali, Yunnan, China.
Angiomatoid fibrous histiocytoma (AFH) is a rare soft tissue tumor with intermediate malignant potential, and it rarely metastasizes. We encountered a unique AFH case where, the tumor was discovered initially in unusual locations-the left lung and the left 4th rib. Combined histological features with FISH and NGS analysis, the diagnosis of AFH was supported, however, it is difficult to determine which of these two is the primary lesion.
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