## Abstract The synthesis of novel analogues of foric acid (FA) antagonists derived from the pyrazino[2,3βc]β1,2,6βthiadiazine 2,2βdioxide system incorporating the glutamic acid side chain at the 7βposition is described. No significant DHFR inhibition of cytotoxic activity has been found with these
Study of the Rotational Isomerism and Synthesis of Glucosides Derived from Pyrazino[2,3-c][1,2,6]thiadiazine 2,2-Dioxides
β Scribed by Goya, Pilar ;Martinez, Ana ;Jimeno, M. Luisa ;Pfleiderer, Wolfgang
- Publisher
- John Wiley and Sons
- Year
- 1987
- Tongue
- English
- Weight
- 307 KB
- Volume
- 1987
- Category
- Article
- ISSN
- 0947-3440
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β¦ Synopsis
GI ucosidationa of Q a m i n o -8 H -p ~o C 3 -c l
[1,2,6llrhiadiazifie 2.2dioxide and its 6,7-dimetbyi-and 6,7-diphenyi derivatives via the "siiylation method" are described. The reaction favors N-1 substitution and the te~-U-acetylglucopyranosyl derivatives j, 6, and 7 as well as the free nude&des 8, 9, and 10 have bwn isolated and characterized by UV, 'H, and 2D-NMR spectroscopy. Tbe latter compound exist at room temperature, as rotationally restricted "syn-mtI" isomers, and the h.ee energies of 'R1 "anti "
"syn" ~1 W n -der Rorrmtiollahmerie uad Syathese VOR Pyraziw~][l~~thiadiPzio-Z,Zdiolrid-Clurosideo Glucosidierurtgen des CAmino-IIH-pyrazino[23-c.] [ 1.2.61thiadiazin-2,2-dioxids und seiner 6,7-Dimethylund Q'I-Diphenyl-l>erivate mit Hilfe der ,.Silyl-Methode" werden beschrieben. Die Reaktion Tihrt bevonugl zu N-l -Substitution. Die entsprechenden Tetr8-O-acetylglu~pyraoosyl-Derivate 5,6 und 7 sowie die h i e n Nucleoside 8 , 9 und 10 wurdeo isolitrt und durcb WV-, 'Hund ZD-MMR-Spektroskopie cbarakterisiert. Die freien Nucleoside liegen bei Raumtemperatur als rotationsgehmderte ,,s)vz/anri"-Isomere vor. Die Creien Energien der Aktivierung wurden berwch-'
π SIMILAR VOLUMES
One pot alkoxylation at position 7 of 6-arylpyrazino [2,3c][1,2,6]thiadiazine 2,2-dioxides with NBS or NCS in the appropriate alcohol is described. Rationalization of the mechanism of the reaction, which does not proceed through the in-