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Arsalan Salamat, Mohammad R Afrasiabi, Rami E Lutfi
BACKGROUND: Postoperative upper gastrointestinal series (UGI) has never been shown to be effective in ruling out leaks or obstruction after gastric bypass or sleeve gastrectomy. In sleeve gastrectomies, UGI will define the shape of the sleeve and rule out a retained fundus that was not optimally excised during surgery. OBJECTIVES: We aimed to investigate the impact of a "retained fundus" on weight loss to determine whether UGIs can be used to gauge success of the operation and predict outcome...
January 27, 2017: Surgery for Obesity and related Diseases: Official Journal of the American Society for Bariatric Surgery
Sze Li Siow, Hans Alexander Mahendran, Chee Ming Wong, Nirumal Kumar Milaksh, Myo Nyunt
BACKGROUND: In recent years, staging laparoscopy has gained acceptance as part of the assessment of resectability of upper gastrointestinal (UGI) malignancies. Not infrequently, we encounter tumours that are either locally advanced; requiring neoadjuvant therapy or occult peritoneal disease that requires palliation. In all these cases, the establishment of enteral feeding during staging laparoscopy is important for patients' nutrition. This review describes our technique of performing laparoscopic feeding jejunostomy and the clinical outcomes...
March 20, 2017: BMC Surgery
Guoqin Yu, Nan Hu, Lemin Wang, Chaoyu Wang, Xiao-You Han, Mike Humphry, Jacques Ravel, Christian C Abnet, Philip R Taylor, Alisa M Goldstein
Little is known about the link between gastric microbiota and the epidemiology of gastric cancer. In order to determine the epidemiologic and clinical relevance of gastric microbiota, we used 16S ribosomal RNA gene sequencing analysis to characterize the composition and structure of the gastric microbial community of 80 paired samples (non-malignant and matched tumor tissues) from gastric cardia adenocarcinoma (GCA) patients in Shanxi, China. We also used PICRUSt to predict microbial functional profiles. Compared to patients without family history of upper gastrointestinal (UGI) cancer in the non-malignant gastric tissue microbiota, patients with family history of UGI cancer had higher Helicobacter pylori (Hp) relative abundance (median: 0...
March 20, 2017: International Journal of Cancer. Journal International du Cancer
Yasuhito Koyama, Prashant G Gudeangadi
We developed a one-pot synthetic technique for alternating peptides. Central to this technique is a new, catalyst-free polymerization based on Ugi's 4CC reaction. The treatment of imines with the ambident molecules bearing both an isocyanide and a carboxylic acid afforded alternating peptides.
March 20, 2017: Chemical Communications: Chem Comm
Goran N Kaluđerović, Muhammad Abbas, Hans Christian Kautz, Mohammad A M Wadaan, Claudia Lennicke, Barbara Seliger, Ludger A Wessjohann
A first example of 5-component 5-center reactions with isonitriles [Ugi-5CRs] is described. The extended Ugi type reactions involve selenoaldehydes as well as ammonia, both challenging reactants in multicomponent (MCR) systems, to generate methionine and Se-methionine moieties and derivatives as protected building blocks or for direct ligation in peptides or peptoids. The peptoid/peptide building blocks proved to be non-cytotoxic but increased the expression of genes encoding for stress protective selenoproteins (Gpx1)...
March 17, 2017: Chemical Communications: Chem Comm
Le Zhen, Jiankun Wang, Qing-Long Xu, Hongbin Sun, Xiaoan Wen, Guangji Wang
A novel Ugi-type reaction triggered by 1,5-hydride shift has been established, giving access to N-arylprolinamides and related compounds in high atom economy and good yields. This is an example of a two starting material-three component reaction. The benzyl alcohol substrate 1 acts as a dual synthon, which upon treatment with a Brønsted acid affords iminium ion and water. Nucleophilic attack at the iminium ion by the third component isocyanide, followed by hydrolysis with the endogenic water, gives the Ugi-type reaction products...
March 14, 2017: Organic Letters
Sang Pyo Lee, Sun-Young Lee, Jeong Hwan Kim, In-Kyung Sung, Hyung Seok Park, Chan Sup Shim
BACKGROUND AND AIM: Upper gastrointestinal (UGI) symptoms are common; however, the role of Helicobacter pylori and gastric corpus atrophy in the generation of these symptoms is controversial. The aim of this study was to determine the risk factors for UGI symptoms in adults in an endemic area of H. pylori infection. METHODS: Korean adults who completed questionnaires on the day of serum anti-H. pylori IgG and pepsinogen (PG) assays before UGI endoscopy were included...
March 9, 2017: Digestive Diseases and Sciences
Suk-Bae Moon
Annular pancreas (AP) is a rare cause of congenital duodenal obstruction that is usually discovered at the neonatal period, but clinical severities can vary over a wide range and definite diagnosis could be delayed until late childhood or adulthood. We report here a case of AP detected in an 11-year-old girl who had a long history of symptoms of partial duodenal obstruction. Upper gastrointestinal (UGI) study revealed narrowed second portion of duodenum by extrinsic compression, and computed tomography demonstrated complete ring of pancreatic tissue surrounding the second portion of the duodenum...
2017: International Medical Case Reports Journal
Yong Li, Jiang-Ping Meng, Jie Lei, Zhong-Zhu Chen, Dian-Yong Tang, Jin Zhu, Jin Zhang, Zhi-Gang Xu
A mild and efficient protocol was developed for the synthesis of oxazepino-isoquinolines via a one-pot Ugi four-component reaction, followed by the intramolecular addition of the resulting alcohol to an alkyne moiety under microwave irradiation conditions. Notably, this process only required one purification step, providing facile access to two series of complex and potentially interesting biologically active scaffolds.
March 8, 2017: ACS Combinatorial Science
Karell Pérez-Labrada, Marco A Cruz-Mendoza, Alejandra Chávez-Riveros, Eduardo Hernández-Vázquez, Tomás Torroba, Luis D Miranda
Synthesis of biaryl-containing macrocycles has been carried out through a four-step approach comprising two Ugi four component reactions and a Suzuki-Miyaura macrocyclization. This protocol allowed the synthesis of 12- and 14-membered macrocycles. Cytotoxic activity evaluation showed that some of the molecules were effective against leukemia, glioblastoma and lung cancer cell lines (IC50 = 4.0, 5.9 and 7.6, respectively).
March 3, 2017: Organic & Biomolecular Chemistry
Pravin Patil, Katarzyna Kurpiewska, Justyna Kalinowska-Tłuścik, Alexander Dömling
Ammonia in the tetrazole Ugi variation together with α-amino acid methyl ester-derived isocyanides provides tetrazolopiperidinones in good to high yields in one pot. The scope and limitations of this reaction were investigated by performing >70 reactions. The scaffold is useful to fill high-throughput screening decks and in structure-based drug design.
March 8, 2017: ACS Combinatorial Science
Huiping Wei, Gaigai Wang, Yingchun Wang, Binbin Li, Jianjun Huang, Stepan Kashtanov, Kristof Van Hecke, Olga P Pereshivko, Vsevolod A Peshkov
A series of new O,O-chelated boron complexes was prepared through four-component Ugi reaction followed by the complexation of the resulting 1,3-dicarbonyl compounds with boron trifluoride diethyl etherate. The optical properties of these novel luminophores were investigated by UV-visible spectroscopy and spectrofluorometry and their aggregation-induced emission (AIE) behavior was revealed.
February 21, 2017: Chemistry, An Asian Journal
Ajay L Chandgude, Alexander Dömling
The Ugi four-component reaction (U-4CR) with N-hydroxyimides as a novel carboxylic acid isostere has been reported. This reaction provides straightforward access to α-hydrazino amides. A broad range of aldehydes, amines, isocyanides and N-hydroxyimides were employed to give products in moderate to high yields. This reaction displays N-N bond formation by cyclic imide migration in the Ugi reaction. Thus, N-hydroxyimide is added as a new acid component in the Ugi reaction and broadens the scaffold diversity.
March 3, 2017: Organic Letters
Ludger A Wessjohann, Oliver Kreye, Daniel G Rivera
An important development in the field of macrocyclization strategies towards molecular cages is described. The approach comprises the utilization of a double Ugi four-component macrocyclization for the assembly of macromulticycles with up to four different tethers, that is, hybrid cages. The innovation of this method rests on setting up the macromulticycle connectivities not through the tethers but through the bridgeheads, which in this case involve N-substituted amino acids. Both dilution and metal-template-driven macrocyclization conditions were implemented with success, enabling the one-pot formation of cryptands and cages including steroidal, polyether, heterocyclic, peptidic, and aryl tethers...
February 17, 2017: Angewandte Chemie
Cátia I C Esteves, M Manuela M Raposo, Susana P G Costa
Novel thienyl and bithienyl amino acids with different substituents were obtained by a multicomponent Ugi reaction between a heterocyclic aldehyde, an amine, an acid and an isocyanide. Due to the presence of the sulphur heterocycle at the side chain, these unnatural amino acids are highly emissive and bear extra electron donating atoms so they were tested for their ability to act as fluorescent probes and chemosensors in the recognition of biomedically relevant ions in acetonitrile and acetonitrile/water solutions...
February 14, 2017: Amino Acids
Yuanze Wang, Pravin Patil, Katarzyna Kurpiewska, Justyna Kalinowska-Tluscik, Alexander Dömling
Isocyanide-based multicomponent reactions (IMCR) are by far the most versatile reactions that can construct relatively complex molecules by one-pot synthesis. More importantly, the development of post IMCR modifications significantly improves the scaffold's diversity. Here, we describe the use of N-Boc protected hydrazine together with α-amino acid derived isocyanides in the Ugi tetrazole reaction and its post cyclization under both acidic and basic conditions. The cyclization in acidic conditions was conducted in a one pot fashion, which give 7-aminotetrazolopyrazinone (6) and tetrazolotriazepinone (7) cyclic products...
March 13, 2017: ACS Combinatorial Science
Arjun Gupta, Ugis Gruntmanis
No abstract text is available yet for this article.
February 1, 2017: JAMA Internal Medicine
Yan-Mei Yan, Yong Rao, Ming-Wu Ding
A new one-pot preparation of indoles by a Ugi-3CR/Wittig sequence has been developed. The reaction of odorless isocyanide-substituted phosphonium salt 5, aldehyde 6, and amine 7 produced the indoles 9 in 45-82% yields via a sequential Ugi-3CR/Wittig reaction in the presence of H3PO4 and solid K2CO3, respectively.
February 10, 2017: Journal of Organic Chemistry
Lionel Rebibo, Cyril Cosse, Brice Robert, Cyril Chivot, Thierry Yzet, Abdennaceur Dhahri, Jean-Marc Regimbeau
BACKGROUND: Recent series have shown the lack of value of routine upper gastrointestinal (UGI) contrast studies on postoperative day 1 or 2 for the detection of gastric leak (GL) after sleeve gastrectomy (SG). Despite this finding, many centers still perform routine early UGI contrast studies after SG. No series has evaluated the impact of eliminating this examination on the overall management of patients undergoing SG. OBJECTIVES: To evaluate the impact of UGI contrast studies on SG management...
October 19, 2016: Surgery for Obesity and related Diseases: Official Journal of the American Society for Bariatric Surgery
Jae Kwan Jun, Kui Son Choi, Hoo-Yeon Lee, Mina Suh, Boyoung Park, Seung Hoon Song, Kyu Won Jung, Chan Wha Lee, Il Ju Choi, Eun-Cheol Park, Dukhyoung Lee
BACKGROUND & AIMS: It is not clear whether screening for gastric cancer by upper endoscopy or upper gastrointestinal (UGI) series examinations (looking at the upper and middle sections of the gastrointestinal tract by imaging techniques) reduces mortality. Nevertheless, the Korean National Cancer Screening Program for gastric cancer was launched in 1999 to screen individuals 40 years and older for gastric cancer using these techniques. We evaluated the effectiveness of these techniques in gastric cancer detection and compared their effects on mortality in the Korean population...
January 29, 2017: Gastroenterology
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