Site-selective functionalization is a core synthetic strategy that has broad implications in organic synthesis. Particularly, exploiting chiral catalysis to control site selectivity in complex carbohydrate functionalizations has emerged as a leading method to unravel unprecedented routes into biologically relevant glycosides. However, robust catalytic systems available to overcome multiple facets of stereoselectivity challenges to this end still remain scarce. Here we report a synergistic chiral Rh(I)- and organoboron-catalysed protocol, which enables access into synthetically challenging but biologically relevant arylnaphthalene glycosides. Our method depicts the employment of chiral Rh(I) catalysis in site-selective carbohydrate functionalization and showcases the utility of boronic acid as a compatible co-catalyst. Crucial to the success of our method is the judicious choice of a suitable organoboron catalyst. We also determine that exquisite multiple aspects of stereocontrol, including enantio-, diastereo-, regio- and anomeric control and dynamic kinetic resolution, are concomitantly operative.
The application of cancer organoids is of great value in individualized therapy as an embodiment of the tumor of a patient, a gastric cancer organoid model was established and its application in individualized drug screening was explored. The primary tumor tissues of 3 patients with gastric cancer who underwent primary surgery at the Fourth Department of General Surgery of the First Hospital of Lanzhou University (Lanzhou, China) between July and August 2021 were selected and digested with mixed enzymes to prepare cell suspensions. Of these, two were cultured by mixing with Matrigel, while the cells from the third patient were placed in a 24-well ultra-low adhesion plate for suspension organoid culture. After intensive organoid growth, they were digested, passaged, cryopreserved and thawed for further analyses. The formation of gastric cancer organoids was observed under an inverted microscope. One case was selected, and organoids were compared with the original tumor tissue via H&E and immunohistochemical staining to evaluate the consistency of the two. Finally, paclitaxel, oxaliplatin and fluorouracil were administered to the organoids to verify the value of screening individualized drugs. It was indicated that the passage and cryopreservation of gastric cancer organoids were successfully established in all three cases. The H&E and immunohistochemical staining results suggested that the structure and protein expression of the organoids were highly similar to those of the source tumor tissue. The use of established gastric cancer organoids for individualized chemotherapy drug screening is of high clinical value. Gastric cancer organoids with high similarity to the original tissue may be successfully constructed by the suspension growth culture method. The established organoids may serve as an effective model for individualized drug screening.
BackgroundUterine perforation is commonly caused by iatrogenic injuries, tumours, and traumas. Uterine perforation resulting from infection is less common, and such perforation rarely causes abdominal empyema and diffuse peritonitis. Infectious complications such as shock and multiple organ dysfunction are extremely dangerous and even life threatening. Correct early diagnosis and appropriate treatment can reduce the mortality of pyometra.Case presentationA 62-year-old woman presented to our hospital with persistent abdominal pain for 5 hours. The patient had undergone hysteroscopy six months ago, and a cystic space-occupying lesion of the uterus was found one month ago. Perfect the various examinations, consider the patient as acute diffuse peritonitis Perforation of the digestive tract? Uterine cavity infection. In the emergency department, laparoscopic exploration was performed. During the operation, it was diagnosed as pyometra and perforation of the right uterine fundus. Then, combined with a gynecologist, a hysterectomy with double appendages was performed. The operation went smoothly. The patient had paralytic intestinal obstruction after the operation. After active symptomatic treatment The patient recovered well and was discharged. Postoperative pathology results were as follows: 1. Moderately differentiated squamous cell carcinoma of the cervix (non-keratinizing type); 2. Metastatic squamous cell carcinoma of the right ovary; 3. Perforation of the fundus of the uterus, pyometra, and extensive purulent inflammation of the muscle wall .ConclusionsUterine perforation is a rare cause of acute abdomen. Clinicians often don't know enough about this, and they are prone to misdiagnosis and missed diagnosis. For elderly women with abdominal pain and peritonitis, the possibility of empyema perforation should be considered during diagnosis and treatment, and the examination should be improved to avoid misdiagnosis, because correct early diagnosis and appropriate treatment can reduce the mortality of empyema.
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