Zobrazeno 1 - 10 of 21 pro vyhledávání: '"DAVID J. LESTER"'
3
Total synthesis of -6-methoxy-1,1-dimethylcarbapen-2-em
Autor: John E. Hengeveld, David J. Lester, Daniel T.W Chu
Publikováno v: Tetrahedron Letters. 24:139-142
The total synthesis of the title compound via an intramolecular aldol condensation, and the novel use of the trimethylsilylethyl ester as a carboxyl protecting group in carbapenem systems, are reported.
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c47dfce5f6754352d3eef9f1fa9836bf
https://doi.org/10.1016/s0040-4039(00)81349-0
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4
Stereospecific and non-hazardous syntheses of and -3-phenoxyacetamido-4-(2-acetoxy-1,1-dimethylethyl)-azetidin-2-ones-key intermediates for the synthesis of 6-amido-1,1-dimethyl-carbapen-2-ems
Autor: Daniel T.W Chu, David J. Lester
Publikováno v: Tetrahedron Letters. 24:135-138
The title compounds have been prepared by a four-step sequence from 3-acetoxy-2,2-dimethyl-1-propanal and a novel non-hazardous and stereospecific route to cis-3-amido-azetidin-2-ones by the use of N-benzyl-N-carbobenzoxyglycine is described.
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::82b24b6cbc7b493c3e8a78d044ad4191
https://doi.org/10.1016/s0040-4039(00)81348-9
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5
ChemInform Abstract: REGENERATION OF KETONES FROM HYDRAZONES, OXIMES, AND SEMICARBAZONES BY BENZENESELENINIC ANHYDRIDE
Autor: David J. Lester, Steven V. Ley, Derek H. R. Barton
Publikováno v: Chemischer Informationsdienst. 8
Treatment of ketone hydrazones, oximes, and semicarbazones with benzeneseleninic anhydride readily affords the parent carbonyl compound in good yields, even in cases resistant to known methodology.
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6194f3f5e0a900c9a8acd1156ea1efb4
https://doi.org/10.1002/chin.197746336
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8
ChemInform Abstract: OXIDATION OF ALCOHOLS USING BENZENESELENINIC ANHYDRIDE
Autor: David J. Lester, Andrew G. Brewster, Thomas G. Back, Raymond A. H. F. Hui, Steven V. Ley, Derek H. R. Barton
Publikováno v: Chemischer Informationsdienst. 10
A number of alcohols have been oxidised by benzeneseleninic anhydride to carbonyl derivatives in high yield; in appropriate cases, the corresponding dehydrogenated compounds are obtained by further oxidation.
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::93935ab5335a5ff07c2c65e717c322eb
https://doi.org/10.1002/chin.197910130
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10
Obsevations on the cleavage of the bismuth–carbon bond in BiVcompounds: a new arylation reaction
Autor: William B. Motherwell, David J. Lester, Derek H. R. Barton, M. Teresa Barros Papoula
Publikováno v: J. Chem. Soc., Chem. Commun.. :246-247
Further examples of the selectivity of pentavalent trianyl-organobismuth oxidants are presented; deuterium labelling studies have established that the mechanism of oxidation of allylic alcohols by these reagents involves, to some extent, cleavage of
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b8d6abb5aaefc7e23f22ef5e9aa3e85e
https://doi.org/10.1039/c39800000246
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