Zobrazeno 1 - 10 of 41 pro vyhledávání: '"Hugo Wyler"'
1
Hetero-Diels-Alder Cycloadditions ofα,β-Unsaturated Acyl Cyanides, Part 4, Substituent Effects in Reactions withp-Substituted Styrenes
Autor: Jin-Cong Zhuo, Hugo Wyler
Publikováno v: Helvetica Chimica Acta. 82:1122-1134
Cycloadditions of α,β-unsaturated acyl cyanides (=2-oxonitriles) 1 – 6 to styrene and its p-substituted derivatives 7a – f,h are of inverse electron demand and provide, under mild conditions, regio- and stereoselectively 2-aryl-3,4-dihydro-2H-p
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3ee8c7ff4f98fc39e38295297a44b49d
https://doi.org/10.1002/(sici)1522-2675(19990707)82:7<1122::aid-hlca1122>3.0.co
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2
Hetero-Diels-Alder Additions of ?,?-Unsaturated-Acyl Cyanides. Part 3. Syntheses of 3-bromo-2-ethoxy-3,4-dihydro-2H-pyran-6-carbonitriles, and about their transformation to 2-ethoxy-2H-pyrans
Autor: Hugo Wyler, Kurt Schenk, Jin-Cong Zhuo
Publikováno v: Helvetica Chimica Acta. 78:151-164
Cycloadditions of the α,β-unsaturated-acyl cyanides 1–3 with (Z)-or (E)-1-bromo-2-ethoxyethene (4) may be performed at moderate temperatures and provide in good yields the 3-bromo-2-ethoxy-3,4-dihydro-2H-pyran-6-carbonitriles 5–7, respectively
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4ec421f335e8120183c640ecd0884eba
https://doi.org/10.1002/hlca.19950780115
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3
NMR of Terminal Oxygen. Part 14. Kinetically stabilized simple enols containing methylated uracil groups: Application of a17O-NMR test of H-bonding
Autor: Jin Cong Zhuo, Hans Dahn, Hugo Wyler, Peter Péchy
Publikováno v: Helvetica Chimica Acta. 77:317-322
In the crystalline N,N′-dimethylated uracil derivatives 2a, b, the kinetically stabilized enol group forms an H-bond with OC(4), as demonstrated by increased shielding of specifically labelled 2a and 2b in the 17O-NMR spectra (Δδ(17O)(C(4)—O)
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6707d1048155ede20612d2912e610241
https://doi.org/10.1002/hlca.19940770131
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4
Hetero-Diels-Alder cycloadditions of ?,?-unsaturated acyl cyanides. Part 2. Reactions withN,N-dimethyluracils, a new route to 5-substituted uracil derivatives
Autor: Hugo Wyler, Jin-Cong Zhuo
Publikováno v: Helvetica Chimica Acta. 76:1916-1927
The [4 + 2] cycloadditions of 2-oxobut-3-enenitrile (1a), 2-oxopent-3-enenitrile (1b), and ethyl 4-cyano-4-oxobut-2-enoate (1c) with 1,3-dimethyluracil (2), 1,3, 6-trimethyluracil (9), or 1,3,5-trimethyluracil (16) were investigated. The reactions of
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1987f8de00e16c45f5d9d41022166f48
https://doi.org/10.1002/hlca.19930760510
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5
ChemInform Abstract: 2,3- and 4,5-Secodopa, the Biosynthetic Intermediates Generated from L- Dopa by an Enzyme System Extracted from the Fly Agaric, Amanita muscaria L., and Their Spontaneous Conversion to Muscaflavin and Betalamic Acid, Respectively, and
Autor: Fernand Terradas, Hugo Wyler
Publikováno v: ChemInform. 22
An enzyme is extracted from the red peel of Amanita muscaria which cleaves the C(2)–C(3) and the C(4)–C(5) bond of the aromatic ring of L-dopa (1) to form a mixture of 4,5-secodopa (= salt of 6-amino-2-hydroxy-4-(2′-oxoethylidene)hept-2-enedioi
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7962983388ec7cc5e1383d7b82916920
https://doi.org/10.1002/chin.199116079
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7
ChemInform Abstract: Hetero-Diels-Alder Cycloadditions of α,β-Unsaturated Acyl Cyanides. Part 2. Reactions with N,N-Dimethyluracils, a New Route to 5- Substituted Uracil Derivatives
Autor: Jin-Cong Zhuo, Hugo Wyler
Publikováno v: ChemInform. 24
The [4 + 2] cycloadditions of 2-oxobut-3-enenitrile (1a), 2-oxopent-3-enenitrile (1b), and ethyl 4-cyano-4-oxobut-2-enoate (1c) with 1,3-dimethyluracil (2), 1,3, 6-trimethyluracil (9), or 1,3,5-trimethyluracil (16) were investigated. The reactions of
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8d74ee03087d0dbc44649347a81a8a8d
https://doi.org/10.1002/chin.199348187
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9
Madeiranes, a New Class of Pentacyclic Triterpenes:D-Friedo-madeir-14-en-3?-ol and -3-one,D:C-Friedomadeir-7-en-3?-ol and -3-one
Autor: Ana M. Lobo, Hugo Wyler, David J. Williams, Maria-José U. Ferreira, Caroline A. O'Mahoney
Publikováno v: Helvetica Chimica Acta. 74:1329-1338
The pentacyclic triterpenes 1a, b and 2a, b are isolated from extracts of Euphorbia mellifera Arr. Their structures, determined by X-ray analysis, are supported in part by MS, NMR, and IR data. The skeleton differs from that of representatives of the
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::bcd3cde6f37d73ed2b99b629c4babff3
https://doi.org/10.1002/hlca.19910740622
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10
The secodopas, natural pigments in Hygrocybe conica and Amanita muscaria
Autor: Hugo Wyler, Fernand Terradas
Publikováno v: Phytochemistry. 30:3251-3253
2,3- and 4,5-Secodopas were shown to be present in small concentrations in extracts from the coloured peels of Amanita muscaria and Hygrocybe conica . They were identified by HPLC by direct comparison with a mixture of authentic samples generated enz
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::fe3fa1ee999f8dcc1cfa3c779b7d7026
https://doi.org/10.1016/0031-9422(91)83187-p
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