Zobrazeno 1 - 10
of 113
pro vyhledávání: '"James R. Bull"'
Autor:
James R. Bull, Nicholas S. Desmond-Smith, Steven J. Heggie, Roger Hunter, Sophie C. M. Rees-Jones
Publikováno v:
ARKIVOC, Vol 2002, Iss 9, Pp 55-61 (2002)
Externí odkaz:
https://doaj.org/article/623b1e3431c84abb8ae61a8e7ba245ae
Chemoselectivity and Unusual Internal Acetal Formation in the Synthesis of a Glycosidation Precursor
Publikováno v:
Synlett. 2007:3175-3179
Chemoselective deprotection of a tert-butyldimethyl (TBS) silyl ether group in the presence of an acetal moiety within an advanced iridoid precursor using scandium trifluoromethanesulfonate at 25 °C unexpectedly leads to internal acetal formation in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3102ab5e3798b3be2933e2aabf3d0218
https://doi.org/10.1055/s-2007-990910
https://doi.org/10.1055/s-2007-990910
Publikováno v:
European Journal of Organic Chemistry. 2007:445-454
The Diels–Alder reaction of 3-methoxyestra-1,3,5(10),14,16-pentaen-17-yl acetate (1) with nitroethylene gives 3-methoxy-16-nitro-14,17-ethenoestra-1,3,5(10)-trien-17β-yl acetate (2). Cycloadduct 2 can be reduced with TiCl3, giving oxazine 3 as a r
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::192d5009ec773b45d5464652a468b5ce
https://doi.org/10.1002/ejoc.200600629
https://doi.org/10.1002/ejoc.200600629
Autor:
Nicholas S. Desmond-Smith, Sophie C. M. Rees-Jones, James R. Bull, Steven J. Heggie, Roger Hunter
Publikováno v:
ARKIVOC, Vol 2002, Iss 9, Pp 55-61 (2002)
An improved procedure for producing the potent cycloaddition dienophile 1,3bis(phenylsulfonyl)allene 1 is described based on ensuring removal of excess triethylamine in the work-up of the final dehydroiodination step. Triethylamine, as well as other
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::143c816ad2a698a5000d6ca9b6fe1dbe
https://www.arkat-usa.org/arkivoc-journal/browse-arkivoc/ark.5550190.0003.907
https://www.arkat-usa.org/arkivoc-journal/browse-arkivoc/ark.5550190.0003.907
Autor:
James R. Bull, Pieter D. de Koning
Publikováno v:
European Journal of Organic Chemistry. 2001:1189-1193
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e26b1b75bc1ca8b4ce7e0be0fa4ba9ec
https://doi.org/10.1002/1099-0690(200103)2001:6<1189::aid-ejoc1189>3.0.co
https://doi.org/10.1002/1099-0690(200103)2001:6<1189::aid-ejoc1189>3.0.co
Publikováno v:
Collection of Czechoslovak Chemical Communications. 66:1777-1796
Cycloaddition of 3-methoxyestra-1,3,5(10),14,16-pentaen-17-yl acetate (1) with 2-chloroacrylonitrile furnishes 17β-acetoxy-16α-chloro-3-methoxy-14,17α-ethenoestra-1,3,5(10)-triene-16β-carbonitrile (2) as the major product, which undergoes alkali-
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::79063a23e7b8f246107682989b327fc3
https://doi.org/10.1135/cccc20011777
https://doi.org/10.1135/cccc20011777
Autor:
James R. Bull, Eugene S. Sickle
Publikováno v:
Journal of the Chemical Society, Perkin Transactions 1. :4476-4487
Methods are described for sequential cycloaddition–fragmentation–recombination and cycloaddition–rearrangement-mediated processes for synthesis of the title compounds. Reaction of methyl vinyl ketone with 3-methoxyestra-1,3,5(10),14,16-pentaen-
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::39b2eb50d99b49b185bc43235ee01468
https://doi.org/10.1039/b005129m
https://doi.org/10.1039/b005129m
Autor:
James R. Bull, Pieter D. de Koning
Publikováno v:
Synthesis. 2000:1761-1765
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9dc14a04c9f910c4ecef09a906973241
https://doi.org/10.1055/s-2000-8210
https://doi.org/10.1055/s-2000-8210
Autor:
James R. Bull, Pieter D. de Koning
Publikováno v:
Journal of the Chemical Society, Perkin Transactions 1. :1003-1013
Synthetic routes to the title compounds are described, commencing with readily available 19-norsteroid precursors. The reaction of 3-methoxy-8α-estra-1,3,5(10),14,16-pentaen-17-yl acetate 3 with phenyl vinyl sulfone at 150 °C proceeded in high yiel
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fe9ad34a31ff3a14ec084b685987f355
https://doi.org/10.1039/a908375h
https://doi.org/10.1039/a908375h
Autor:
Pia G. Mountford, James R. Bull
Publikováno v:
Journal of the Chemical Society, Perkin Transactions 1. :1581-1588
14-Allyl-3-methoxy-14β-estra-1,3,5(10),15-tetraen-17-one 1 undergoes competitive Wacker oxidation at C-2′ and C-3′ to give the 14β-formylethyl and 14β-acetonyl Δ15-17-ketones 2 and 3 respectively. Alkaline treatment of 3 results in efficient
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9da675aa4ffc34e5689f5c1b0f8f9447
https://doi.org/10.1039/a901268k
https://doi.org/10.1039/a901268k