Zobrazeno 1 - 10
of 12
pro vyhledávání: '"Takashi Siroi"'
Autor:
Junzo Nokami, Michio Sasaoka, Makoto Satsuki, Norio Saitoh, Sigeru Torii, Takashi Siroi, Hideo Tanaka
Publikováno v:
Chemistry Letters. 10:1575-1578
Electro-hydrogenation of the C=N double bond of thiazoline–azetidinone derivatives derived from penicillins G and V in an aqueous HClO4–CH2Cl2–(Pb electrodes) system by changing the current direction every 30 s gave thiazolidine-azetidinones in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6614fc81b384de2be2285dbfc7f8d27b
https://doi.org/10.1246/cl.1981.1575
https://doi.org/10.1246/cl.1981.1575
Publikováno v:
Tetrahedron Letters. 25:1801-1804
A successful synthesis of clinically significant cephalosporins 2a-c with use of all the framework elements of penicillin G is described.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::439a6e0400b7dd7139a4f7e1284c8773
https://doi.org/10.1016/s0040-4039(01)90045-0
https://doi.org/10.1016/s0040-4039(01)90045-0
Publikováno v:
Tetrahedron Letters. 25:2017-2020
New ring-opening reaction of thiazoline-azetidinones 1 to dithioazetidinones 2 was achieved with 2-benzothiazolyl disulfide in aqueous acidic media and its potentiality for the preparation of a variety of cephalosporins 3 from various thiazoline-azet
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4d5d1375b609dcbe8a98e02a0277f886
https://doi.org/10.1016/s0040-4039(01)90101-7
https://doi.org/10.1016/s0040-4039(01)90101-7
Publikováno v:
Tetrahedron Letters. 23:2495-2498
Direct transformation of thiazoline-azetidinones 2 , derived from penicillin G and V, into 3′-thio-substituted cephalosporins 4 has been performed by ring opening of the thiazoline moiety with sulfenyl chlorides followed by ring closure with NH3 in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5367233e29e06dd4ece8f39cea0757a8
https://doi.org/10.1016/s0040-4039(00)87378-5
https://doi.org/10.1016/s0040-4039(00)87378-5
Publikováno v:
Tetrahedron Letters. 22:3193-3196
Chemoselective electrochlorination of the methyl group on the 3-methyl-3-butenoate moiety of thiazoline-azetidinone derivatives derived from penicillins G and V has been performed in a CH 2 Cl 2 -H 2 O-NaCl-H 2 SO 4 -(Pt or C electrodes) system by ad
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e3de5806311bbee8688b3da5b866d355
https://doi.org/10.1016/s0040-4039(01)81861-x
https://doi.org/10.1016/s0040-4039(01)81861-x
Publikováno v:
The Journal of Organic Chemistry. 48:3551-3553
A partir de benzyl-3 «α»-isopropenyl oxo-7 thia-4 diaza-2,6 bicyclo [3.2.0] heptene-2 carboxylate-6 de benzyle, par l'intermediaire de chloration electrochimique, de scission, puis de recyclisation, obtention de R-2 R-methyl-3 phenylacetamido-7 ce
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7b95e2dc30aa235eaac66a47bd573404
https://doi.org/10.1021/jo00168a036
https://doi.org/10.1021/jo00168a036
Publikováno v:
Chemischer Informationsdienst. 14
The potentiality of electrolysis procedures in the penicillin-cephalosporin conversion as well as in the direct transform of penicillins into oxazolineazetidinones as an intermediate for the preparation of the sulfur-free analogues of cephalosporins
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d74514a2e10aaf5c3cccc9df5e466329
https://doi.org/10.1002/chin.198310355
https://doi.org/10.1002/chin.198310355
Autor:
M. Satsuki, Shigeru Torii, Junzo Nokami, Takashi Siroi, Michio Sasaoka, Hideo Tanaka, Norio Saitoh
Publikováno v:
Chemischer Informationsdienst. 13
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5bf3d638428bd39cec389d9f15980ef9
https://doi.org/10.1002/chin.198221073
https://doi.org/10.1002/chin.198221073
Autor:
Junzo Nokami, Shigeru Torii, Hideo Tanaka, N. Tada, Michio Sasaoka, Takashi Siroi, Norio Saitoh
Publikováno v:
Chemischer Informationsdienst. 14
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::53a6957199ee26890742852ef3e33339
https://doi.org/10.1002/chin.198318333
https://doi.org/10.1002/chin.198318333
Autor:
Hideo Tanaka, Sigeru Torii, Norio Saitoh, Tomoyuki Madono, Junzo Nokami, Michio Sasaoka, Takashi Siroi
Publikováno v:
Bulletin of the Chemical Society of Japan. 56:1567-1568
Efficient conversion of 2-(7-oxo-2,6-diaza-4-thiabicyclo[3.2.0]hept-2-en-6-yl)-3-chloromethyl-3-butenoates (4), derived from natural penicillins, into 3-methylenecephams (1) has been performed by a simple two-step operation, which comprises replaceme
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f3dfa77f220ec084203867d8dcafd500
https://doi.org/10.1246/bcsj.56.1567
https://doi.org/10.1246/bcsj.56.1567