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Table representation of search results timeline featuring number of search results per year.

Year Number of Results
1966 1
1967 1
1968 2
1969 2
1971 2
1973 1
1974 2
1975 6
1976 3
1977 4
1978 2
1980 7
1981 3
1982 7
1983 6
1984 6
1985 4
1986 4
1987 13
1988 7
1989 10
1990 13
1991 15
1992 15
1993 21
1994 20
1995 27
1996 20
1997 19
1998 28
1999 30
2000 32
2001 25
2002 33
2003 48
2004 55
2005 57
2006 54
2007 68
2008 77
2009 92
2010 99
2011 88
2012 114
2013 133
2014 114
2015 147
2016 141
2017 171
2018 161
2019 184
2020 174
2021 189
2022 210
2023 185
2024 63

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2,702 results

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Page 1
Diagnostic and therapeutic approach to upper gastrointestinal bleeding.
Poddar U. Poddar U. Paediatr Int Child Health. 2019 Feb;39(1):18-22. doi: 10.1080/20469047.2018.1500226. Epub 2018 Jul 30. Paediatr Int Child Health. 2019. PMID: 30058470 Review.
BACKGROUND: There is a lack of clarity about the approach to and management of upper gastrointestinal (UGI) bleeding in children. AIM: To examine the recent literature on UGI bleeding in children in order to outline the diagnostic approach and management. ...RESULTS …
BACKGROUND: There is a lack of clarity about the approach to and management of upper gastrointestinal (UGI) bleeding in children. AIM …
Mucosal lesions of the upper gastrointestinal tract in patients with ulcerative colitis: A review.
Sun Y, Zhang Z, Zheng CQ, Sang LX. Sun Y, et al. World J Gastroenterol. 2021 Jun 14;27(22):2963-2978. doi: 10.3748/wjg.v27.i22.2963. World J Gastroenterol. 2021. PMID: 34168401 Free PMC article. Review.
However, UC-related UGI tract manifestations are varied and frequently silenced or concealed. Moreover, the endoscopic and microscopic characteristics of UGI tract complicated with UC are nonspecific. Therefore, UGI involvement may be ignored by many clinicia …
However, UC-related UGI tract manifestations are varied and frequently silenced or concealed. Moreover, the endoscopic and microscopi …
Ugi Four-Component Reactions Using Alternative Reactants.
Hooshmand SE, Zhang W. Hooshmand SE, et al. Molecules. 2023 Feb 8;28(4):1642. doi: 10.3390/molecules28041642. Molecules. 2023. PMID: 36838630 Free PMC article. Review.
The Ugi four-component reaction (Ugi-4CR) undoubtedly is the most prominent multicomponent reaction (MCRs) that has sparked organic chemists' interest in the field. ...Consequently, this review will delve deeper into alternative components used in the Ugi MCR …
The Ugi four-component reaction (Ugi-4CR) undoubtedly is the most prominent multicomponent reaction (MCRs) that has sparked or …
Post-Ugi Cyclizations Towards Polycyclic N-Heterocycles.
Tang X, Song L, Van der Eycken EV. Tang X, et al. Chem Rec. 2023 Oct;23(10):e202300095. doi: 10.1002/tcr.202300095. Epub 2023 May 23. Chem Rec. 2023. PMID: 37218998 Review.
The Ugi reaction has become one of the highly explored reactions for the formation of multifunctional adducts, due to the mild reaction conditions, wide scope and high variability. ...Considering the significance of polycycles, diverse post-Ugi transformations have …
The Ugi reaction has become one of the highly explored reactions for the formation of multifunctional adducts, due to the mild reacti …
'Atypical Ugi' tetrazoles.
Abdelraheem EMM , Goodwin I , Shaabani S , de Haan MP , Kurpiewska K , Kalinowska-Tłuścik J , Dömling A . Abdelraheem EMM , et al. Chem Commun (Camb). 2020 Feb 11;56(12):1799-1802. doi: 10.1039/c9cc09194g. Chem Commun (Camb). 2020. PMID: 31950120
Amino acid-derived isocyano amides together with TMSN3, oxocomponents and 1 or 2 amines are common substrates in the Ugi tetrazole reaction. We surprisingly found that combining these substrates gives two different constitutional isomeric Ugi products A and B. A is …
Amino acid-derived isocyano amides together with TMSN3, oxocomponents and 1 or 2 amines are common substrates in the Ugi tetrazole re …
Microwave-Assisted Post-Ugi Reactions for the Synthesis of Polycycles.
Song L, Cai L, Van der Eycken EV. Song L, et al. Molecules. 2022 May 12;27(10):3105. doi: 10.3390/molecules27103105. Molecules. 2022. PMID: 35630582 Free PMC article. Review.
Microwave irradiation and post-Ugi reactions own their respective advantages in comparison with other strategies. The combination of microwave irradiation and post-Ugi reactions shows paramount importance in the construction of polycycles. ...
Microwave irradiation and post-Ugi reactions own their respective advantages in comparison with other strategies. The combination of …
Propargyl Amines: Versatile Building Blocks in Post-Ugi Transformations.
Bhoraniya RB, Modha SG. Bhoraniya RB, et al. ChemistryOpen. 2023 Apr;12(4):e202200223. doi: 10.1002/open.202200223. Epub 2023 Jan 31. ChemistryOpen. 2023. PMID: 36720775 Free PMC article. Review.
The propargyl amines come as an obvious choice in this context as they work wonderfully as an amine component in the Ugi reaction, while post-Ugi alkyne activation has the potential to generate biologically interesting carbo- and hetero-cyclic systems. ...In this re …
The propargyl amines come as an obvious choice in this context as they work wonderfully as an amine component in the Ugi reaction, wh …
Regioselective Synthesis of Functionalized Pyrrolo[1,2-a]pyrazine-3,6(2H,4H)-diones via Tandem Post-Ugi Cyclization and Gold(I)-Catalyzed Annulation.
Singh SP, Kumar A, Kant R, Srivastava AK. Singh SP, et al. J Org Chem. 2022 Oct 7;87(19):12799-12815. doi: 10.1021/acs.joc.2c01404. Epub 2022 Sep 23. J Org Chem. 2022. PMID: 36149815
A convenient synthesis of less explored pyrrolo[1,2-a]pyrazine-3,6(2H,4H)-diones is described in two steps from Ugi adducts. The method involves acid-mediated cyclization of Ugi adducts to form dihydropyrazinones followed by gold(I)-catalyzed regioselective annulati …
A convenient synthesis of less explored pyrrolo[1,2-a]pyrazine-3,6(2H,4H)-diones is described in two steps from Ugi adducts. The meth …
Cyclic Imines in Ugi and Ugi-Type Reactions.
Nazeri MT, Farhid H, Mohammadian R, Shaabani A. Nazeri MT, et al. ACS Comb Sci. 2020 Aug 10;22(8):361-400. doi: 10.1021/acscombsci.0c00046. Epub 2020 Jul 14. ACS Comb Sci. 2020. PMID: 32574488 Review.
Ugi four-component reactions (U-4CRs) are widely recognized as being highly efficient for the synthesis of pseudopeptides. ...This Review includes all research articles related to Ugi reactions based on the cyclic imines to the year 2020 and will be useful to chemis …
Ugi four-component reactions (U-4CRs) are widely recognized as being highly efficient for the synthesis of pseudopeptides. ...This Re …
Multicomponent Ugi reaction as a tool for fast and easy preparation of stationary phases for hydrophilic interaction liquid chromatography. Part I: The influence of attachment and spacing of the functional ligand obtained via the Ugi reaction.
Chikurova NY, Shemiakina AO, Shpigun OA, Chernobrovkina AV. Chikurova NY, et al. J Chromatogr A. 2022 Mar 15;1666:462804. doi: 10.1016/j.chroma.2022.462804. Epub 2022 Jan 14. J Chromatogr A. 2022. PMID: 35131518
The adsorbent obtained by direct substrate modification by the Ugi reaction showed the increase of hydrophilicity according to the Tanaka test and high selectivity toward all the analytes with separation efficiency of up to 40000 N/m. ...The effect of introducing 1,4-BDDGE …
The adsorbent obtained by direct substrate modification by the Ugi reaction showed the increase of hydrophilicity according to the Ta …
2,702 results