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https://www.readbyqxmd.com/read/28080069/direct-construction-of-2-3-dihydroxy-2-3-diaryltetrahydrofurans-via-n-heterocyclic-carbene-base-mediated-domino-reactions-of-aromatic-aldehydes-and-vinyl-selenone
#1
Atanu Bhaumik, Ram Subhawan Verma, Bhoopendra Tiwari
A one-pot, stereoselective construction of 2,3-dihydroxy-2,3-diaryltetrahydrofurans has been achieved via N-heterocyclic carbene (NHC)/base-mediated domino reactions of aldehydes and vinyl selenone. The products containing two contiguous quaternary hydroxyl functionalities among the three stereocenters are obtained advantageously as either acetals or ketals through the formation of five new chemical bonds in a single operation. This report constitutes an altogether different reactivity of vinyl selenone in comparison with the corresponding sulfones and phosphonates under NHC/base-mediated reactions...
January 12, 2017: Organic Letters
https://www.readbyqxmd.com/read/28073204/who-apparently-more-spends-in-reality-spends-less-spending-a-little-more-for-the-rental-of-the-extracorporeal-lithotripter-can-save-a-lot-about-the-days-of-hospitalization-for-urinary-stones
#2
Giuseppe Albino, Francesco Albergo
OBJECTIVE: The right to health (according to the Article 32 of the Italian Republic Constitution) is financially conditioned; for this reason the National Health System (NHS) has the objective of rationalize health expenditure according to the criteria of efficiency, effectiveness and economy. This paper is an example of rationalization concerning the extracorporeal shock wave lithotripsy (ESWL). MATERIALS AND METHODS: Hospital admissions for urinary stones were taken into account...
December 30, 2016: Archivio Italiano di Urologia, Andrologia
https://www.readbyqxmd.com/read/28072805/anatomical-variants-of-the-pudendal-nerve-observed-during-a-transgluteal-surgical-approach-in-a-population-of-patients-with-pudendal-neuralgia
#3
Stephane Ploteau, Marie-Aimee Perrouin-Verbe, Jean-Jacques Labat, Thibault Riant, Amelie Levesque, Roger Robert
BACKGROUND: Several studies have described the course and anatomical relations of the pudendal nerve. Several surgical nerve decompression techniques have been described, but only the transgluteal approach has been validated by a prospective randomized clinical trial. The purpose of this study was to describe the course of the nerve and its variants in a population of patients with pudendal neuralgia in order to guide the surgeon in the choice of surgical approach for pudendal nerve decompression...
January 2017: Pain Physician
https://www.readbyqxmd.com/read/28060172/applications-of-burow-s-grafts-in-the-reconstruction-of-mohs-micrographic-surgery-defects
#4
Anastasia Benoit, Brian C Leach, Joel Cook
BACKGROUND: Surgical defects in anatomically challenging locations, such as near free margins or crossing cosmetic subunits, may present reconstructive challenges to the dermatologic surgeon. For selected defects, Burow's grafts may produce functional and aesthetic results in a single operative session. OBJECTIVE: To describe the applications of the Burow's graft technique for the repair of defects after Mohs micrographic surgery. METHODS: An institutional review board-approved retrospective database review of surgical defects repaired with Burow's grafting after Mohs micrographic surgery at the Medical University of South Carolina was performed...
December 29, 2016: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
https://www.readbyqxmd.com/read/28054079/gold-catalyzed-sequential-annulations-towards-3-4-fused-bi-tri-cyclic-furans-involving-a-3-2-2-cycloaddition
#5
Suna Liu, Pu Yang, Shiyong Peng, Chenghao Zhu, Shengyu Cao, Jian Li, Jiangtao Sun
A gold-catalyzed sequential annulation reaction to prepare 3,4-fused bicyclic furan compounds has been realized by employing 2-(1-alkynyl)-2-alken-1-ones and 1,3,5-triazines as the starting materials under mild reaction conditions. This protocol features multiple bond formation in a single operation with the incorporation of two nitrogen and two carbon atoms into the final products. A mechanistic investigation reveals that the sequential annulations involved an unprecedented stepwise [3+2+2]-cycloaddition.
January 5, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28050063/a-radiographic-study-of-external-apical-root-resorption-in-patients-treated-with-single-phase-fixed-orthodontic-therapy
#6
S S Agarwal, S S Chopra, Prasanna Kumar, B Jayan, K Nehra, Mohit Sharma
BACKGROUND: External apical root resorption (EARR) is one of the most common iatrogenic consequences of orthodontic tooth movement. Many factors like gender, duration, orthodontic force and duration of orthodontic treatment have been implicated to cause EARR. METHODS: Pre- and post-treatment OPGs of 60 orthodontic patients (30 males and 30 females) who had undergone treatment with a single phase of fixed orthodontic therapy were randomly selected from institutional archives...
December 2016: Medical Journal, Armed Forces India
https://www.readbyqxmd.com/read/28045317/a-retrospective-study-of-root-canal-therapy-in-non-vital-primary-molars
#7
K M Stallaert, M J Sigal, K C Titley, P B Andrews
AIM: This study was performed to assess the clinical and radiographic success rates of a formocresol and zinc oxide eugenol (ZOE) primary molar root canal therapy (RCT) technique. The effects of this treatment on the permanent successors and on exfoliation times were also investigated. MATERIALS AND METHODS: Study design: the retrospective study included 161 patients with 211 primary molars treated by RCT by a single operator in a private paediatric dental office in the Toronto area...
December 2016: European Journal of Paediatric Dentistry: Official Journal of European Academy of Paediatric Dentistry
https://www.readbyqxmd.com/read/28041805/basilic-elevation-transposition-may-improve-the-clinical-outcomes-for-superficialization-of-basilic-arteriovenous-fistula-veins
#8
Shouwen Wang, Michele S Wang, William C Jennings
OBJECTIVE: Basilic vein arteriovenous fistulas are an important and common option for hemodialysis access and require superficialization before use. Various superficialization techniques have been employed, such as basilic tunnel transposition (BTT), basilic elevation, and basilic elevation transposition (BET). Each technique may have advantages and disadvantages, and there have been few reports directly comparing the outcomes of these techniques. This report compares the clinical outcomes of BET vs BTT performed by a single operator and discusses some technical considerations derived from this study and the literature...
December 29, 2016: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/28005165/free-lateral-tarsal-artery-perforator-flap-with-functioning-extensor-digitorum-brevis-muscle-for-thenar-reconstruction-a-case-report
#9
Tianliang Wang, Subhash Regmi, Hongjun Liu, Junbo Pan, Ruixing Hou
In this case report, we describe reconstructive surgery in one patient using a free lateral tarsal artery perforator flap with a functioning extensor digitorum brevis muscle. A 47-year-old woman sustained a crush-avulsion injury to her dominant right hand while working in a factory. A large thenar skin and muscle defect (5.5 cm × 4.0 cm) occurred as a consequence of surgical debridement. The skin and muscle defect was repaired using a free lateral tarsal artery perforator flap with a functioning extensor digitorum brevis muscle in a single operation...
December 22, 2016: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/28005103/fat-embolism-syndrome-with-cerebral-fat-embolism-associated-with-long-bone-fracture
#10
Steven F DeFroda, Stephen A Klinge
Fat embolism syndrome (FES) is a well-known sequela of long-bone fracture and fixation. FES most commonly affects the pulmonary system. Brain emboli may lead to a symptomatic cerebral fat embolism (CFE), which is devastating. In this article, we review the presentation, causes, and management of FES presenting with CFE, report a case, and review the literature. The case involved an otherwise healthy 42-year-old woman who developed CFE after reamed intramedullary nail fixation of femoral and tibial shaft fractures during a single operation...
November 2016: American Journal of Orthopedics
https://www.readbyqxmd.com/read/27996097/prevention-of-cardiac-implantable-electronic-device-infections-single-operator-technique-with-use-of-povidone-iodine-double-gloving-meticulous-aseptic-antiseptic-measures-and-antibiotic-prophylaxis
#11
Antonis S Manolis, Helen Melita
BACKGROUND: Cardiac implantable electronic device (CIED) implantation is complicated by infection still at a worrisome rate of 2-5%. Since early on during device implantation procedures, we have adopted an infection preventive technique which has hitherto resulted in effective prevention of infections. Herein we present our results of applying this technique by a single operator in a prospective series of 762 consecutive patients undergoing device implantation. METHODS: A meticulous search for and treatment of active, occult or smoldering infection was undertaken preoperatively...
December 20, 2016: Pacing and Clinical Electrophysiology: PACE
https://www.readbyqxmd.com/read/27986096/comparison-of-mineral-trioxide-aggregate-and-iroot-bp-plus-root-repair-material-as-root-end-filling-materials-in-endodontic-microsurgery-a-prospective-randomized-controlled-study
#12
Wei Zhou, Qinghua Zheng, Xuelian Tan, Dongzhe Song, Lan Zhang, Dingming Huang
INTRODUCTION: This prospective randomized controlled study evaluated the clinical and radiographic outcome of endodontic microsurgery when using iRoot BP Plus Root Repair Material (BP-RRM; Innovative BioCeramix Inc, Vancouver, BC, Canada) or mineral trioxide aggregate (MTA) as the retrograde filling material and analyzed the relationship between some potential prognostic factors and the outcome of the surgery. METHODS: By using strict inclusion and exclusion criteria, 240 teeth were successfully enrolled and randomly and equally allocated to either the MTA or BP-RRM treatment group...
January 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/27982480/chemoselective-suzuki-miyaura-cross-coupling-via-kinetic-transmetallation
#13
James W B Fyfe, Neal J Fazakerley, Allan J B Watson
Chemoselective Suzuki-Miyaura cross-coupling generally requires a designed deactivation of one nucleophile towards transmetallation. Here we show that boronic acids can be chemoselectively reacted in the presence of ostensibly equivalently reactive boronic acid pinacol (BPin) esters by kinetic discrimination during transmetallation. Simultaneous electrophile control allows sequential chemoselective cross-couplings in a single operation in the absence of protecting groups.
December 16, 2016: Angewandte Chemie
https://www.readbyqxmd.com/read/27978646/ru-catalyzed-one-pot-diannulation-of-heteroaryls-direct-access-to-%C3%AF-conjugated-polycyclic-amides
#14
Majji Shankar, Koushik Ghosh, Kallol Mukherjee, Raja K Rit, Akhila K Sahoo
A novel Ru-catalyzed oxidative double annulation of heteroarenes with symmetrical and unsymmetrical alkynes is reported. A general method for the unsymmetrical annulation of heteroarenes with two distinct alkynes is showcased for the first time. Methylphenyl sulfoximine (MPS) plays an important role in the annulations of heteroarenes and allows the construction of structurally complex π-conjugated heteroarene-fused polycyclic amide skeletons via the formation of multiple C-C and C-N bonds in a single operation...
December 16, 2016: Organic Letters
https://www.readbyqxmd.com/read/27977929/chiral-rhodium-iii-complex-catalyzed-cascade-michael-alkylation-reactions-enantioselective-synthesis-of-cyclopropanes
#15
Gui-Jun Sun, Jun Gong, Qiang Kang
Chiral Rh(III) complex catalyzed highly efficient enantioselective cyclopropanation of α,β-unsaturated 2-acyl imidazoles or pyridine with 2-bromomalonate is developed to generate corresponding multisubstituted cyclopropanes in 70-99% yields with 93→99% enantioselectivity. The proficiency of the process is also demonstrated in gram scale reaction maintaining same reactivity and selectivity level in lower catalyst loading. Moreover, the developed methodology is applicable in challenging synthesis of biscyclopropane scaffold with 97% ee in a single operation...
December 27, 2016: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/27976989/a-breath-ammonia-analyser-for-monitoring-patients-with-end-stage-renal-disease-on-haemodialysis
#16
J Limeres, J F Garcez, J S Marinho, A Loureiro, M Diniz, P Diz
OBJECTIVE: Breath ammonia measurement has attracted increasing interest for clinical diagnosis and metabolic status monitoring. This pilot study aims to evaluate a simple detection method to measure breath ammonia levels in haemodialysis patients. MATERIALS AND METHODS: The study group comprised 44 adults undergoing haemodialysis and a control group of 44 age- and sex-matched individuals with a glomerular filtration rate >90 mL/min. To measure breath ammonia concentration, we designed a device based on that used to monitor atmospheric air, which uses a specific colorimetric tube...
December 15, 2016: British Journal of Biomedical Science
https://www.readbyqxmd.com/read/27976898/polycyclic-ring-formation-using-bis-diazolactams-for-cascade-stitching
#17
Sara A Bonderoff, Albert Padwa
The chemoselective reaction of donor/acceptor (D/A) and acceptor/acceptor (A/A) diazo moieties in the same molecule was examined using 3-diazo-1-(ethyl 2-diazomalonyl)indolin-2-one under rhodium(II) catalysis. The metallo carbenoid derived from the D/A diazo group is preferentially formed and undergoes selective CH, NH, and OH insertion reactions, cyclopropanation, cyclopropenation, sulfur ylide formation/2,3-sigmatropic rearrangement, as well as nitrogen ylide formation followed by azetidine ring expansion...
December 27, 2016: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/27960583/effect-of-aging-on-retinal-nerve-fiber-layer-thickness-in-normal-asian-indian-eyes-a-longitudinal-study
#18
Tarannum Mansoori, Nagalla Balakrishna
PURPOSE: To determine longitudinal retinal nerve fiber layer (RNFL) thickness measurement change with aging, after a period of 3 years using spectral optical coherence tomography/scanning laser ophthalmoscope (OCT/SLO). METHODS: A total of 50 eyes of 25 normal subjects underwent RNFL thickness measurement in 2008 and again in 2011 by a single operator, using spectral OCT/SLO. Measurements were compared at baseline and at follow-up. Linear mixed model analysis was used to measure the effect of age on RNFL thickness measurements over the 3 years...
February 2017: Ophthalmic Epidemiology
https://www.readbyqxmd.com/read/27859768/evolution-of-a-polyene-cyclization-cascade-for-the-total-synthesis-of-cyclosmenospongine
#19
Klaus Speck, Thomas Magauer
We report a full account on the development of a unique cationic polyene cyclization for the total synthesis of the tetracyclic meroterpenoid (-)-cyclosmenospongine. A highly convergent three-component coupling strategy enabled rapid access to individual cyclization precursors that were tested for their reactivity. The successful transformation generates three rings and sets four consecutive stereocenters in a single operation proceeding in a highly efficient manner to give exclusively the trans-decalin framework...
November 17, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27852082/intraductal-necrosectomy-for-pancreatic-walled-off-necrosis-using-novel-single-operator-pancreatoscope
#20
Takeshi Ogura, Wataru Takagi, Saori Onda, Tastsushi Sano, Kazuhide Higuchi
No abstract text is available yet for this article.
January 2016: Endoscopy
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