Zobrazeno 1 - 10
of 70
pro vyhledávání: '"Joseph Cs. Jaszberenyi"'
Autor:
Mireille Le Hyaric, Joseph Cs. Jaszberenyi, Tetsuro Shinada, Wansheng Liu, Mauro V. De Almeida, Hélio F. Dos Santos, Derek H. R. Barton
Publikováno v:
Tetrahedron. 57:8767-8771
d -glucono 1,5-lactone was converted to O-protected d -gluconic acids. The latter were transformed to gluco-KDO derivatives using Barton ester-based radical chemistry with high diastereoselectivity.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::48920531fb2e28df3912de5349b88685
https://doi.org/10.1016/s0040-4020(01)00865-1
https://doi.org/10.1016/s0040-4020(01)00865-1
Publikováno v:
Tetrahedron. 52:14673-14688
Various hydrazone derivatives of α-keto esters were prepared. The carbonyl group was readily regenerated in high yield from phenylhydrazones through oxidative hydrolysis using hypervalent organoiodine(III) reagents—either bis(trifluoroacetoxy)-iod
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::027ee6e3753e870962b7a7795ed97063
https://doi.org/10.1016/0040-4020(96)00940-4
https://doi.org/10.1016/0040-4020(96)00940-4
Publikováno v:
Tetrahedron Letters. 37:3491-3494
Denitration of various important intermediates in the synthesis of sorgolactone and its analogs using radical chemistry on nitroketones or on the derived isocyanides is described. The nitro group is needed for the first step of the annellation proces
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8cfc8dda3255ace496433f04e8eaf3be
https://doi.org/10.1016/0040-4039(96)00560-6
https://doi.org/10.1016/0040-4039(96)00560-6
Publikováno v:
Tetrahedron. 52:2717-2726
An application of the Barton ester based radical reactions in carbohydrate chemistry is described. The chain-elongation reaction with ethyl α-trifluoroacetoxy acrylate 2 , followed by treatment with phenylhydrazine provided 3-deoxy-α-hydrazono-octu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::80b536e048567b494fb703352d77c510
https://doi.org/10.1016/0040-4020(95)01089-0
https://doi.org/10.1016/0040-4020(95)01089-0
Publikováno v:
Tetrahedron. 51:1867-1886
Carboxylic acids can be transformed into the homologous α-keto acids by Barton-ester based radical chemistry. This method was especially successful when ethyl α-trifluoroacetoxy acrylate was used as a radical trap.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::109717633df510386940b2274fe70063
https://doi.org/10.1016/0040-4020(94)01054-4
https://doi.org/10.1016/0040-4020(94)01054-4
Publikováno v:
Tetrahedron Letters. 35:6057-6060
A new synthesis of thiols in high yield utilizing carbon radicals and elemental sulfur is demonstrated. The procedure is applicable to 1°, 2° and 3° carboxylic acids.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bfe925cbd1f874ba92671d50b3d84002
https://doi.org/10.1016/0040-4039(94)88074-3
https://doi.org/10.1016/0040-4039(94)88074-3
Publikováno v:
Tetrahedron Letters. 35:6457-6460
Thionothiocarbonates as well as the corresponding selenium compounds are good radicophilic starting materials for the efficient radical chain reactions of alcohols.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::afac99379e25f8234fe259fda95249c0
https://doi.org/10.1016/s0040-4039(00)78245-1
https://doi.org/10.1016/s0040-4039(00)78245-1
Publikováno v:
Tetrahedron Letters. 35:2869-2872
The addition of Se-phenyl p -tolueneselenosulfonate 1 to electron rich olefins 4a–4e upon visible light photolysis with a catalytic amount of tris(2,2′-bipyridine)ruthenium(II) gives adducts 5 in high yield.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dd9a25abcde510aec07d93230a04bc90
https://doi.org/10.1016/s0040-4039(00)76646-9
https://doi.org/10.1016/s0040-4039(00)76646-9
Publikováno v:
Tetrahedron Letters. 34:8051-8054
Nitroalkanes can be transformed into olefins in high yielding reactions via nitroolefins and β-nitro trithiocarbonates in radical olefination reactions.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::78b060d275f1207fcb2213ce16739b73
https://doi.org/10.1016/s0040-4039(00)61448-x
https://doi.org/10.1016/s0040-4039(00)61448-x
Publikováno v:
Tetrahedron Letters. 34:7191-7194
α-Ketoacids and ketones can easily be regenerated in high yield from their phenylhydrazones via hydroxy azo compounds upon oxidation with hupervalent iodine reagents.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::62be5336749ed1466c4681e9e456ad61
https://doi.org/10.1016/s0040-4039(00)79284-7
https://doi.org/10.1016/s0040-4039(00)79284-7