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Tetrahydro-1,2,3,4 pyrimidines et octahydro-1,2,3,4,5,6,7,8 quinazolines dithiones-2,4 et diones-2,4 synthese et etude du mecanisme

✍ Scribed by A.M. Lamazouere; J. Sotiropoulos

Publisher: Elsevier Science
Year: 1981
Tongue: French
Weight: 657 KB
Volume: 37
Category: Article
ISSN: 0040-4020
DOI: 10.1016/s0040-4020(01)88901-8

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✦ Synopsis

Rtca'wd in Fmrcc 3 Ocrobu l980) R&o&lJne syntMse des t&ahydropyrimidincs ditbionrs CI octahydroquiwzdincs dithinncs CSI rtPliste par action directe. en milieu bsiquc. des isothiocyanatcs d'akoyle ou d'aryk sur let c&ones pos&dant. au moins. un atome d'hydrogtnc en o du groupcmcnt carbonylc. L'approfomlissemcnt cl la chr&Aon du mCunismc compkxe de CCIIC rCa&n onI CIC IentCs. L'accts aux dioncs conespondantes cst possibk par &sulfuntbn des dithioncs. Abatr~I-A rynlhcsis of ~e~rahydropyrimidirudithiones and ocrahydroquinazoliaedithioncs has been realized by direct a&n. in basic media. of alkyl or uyl isothiocyanatrs on ketones posscssirg at least an hydrogen atom in an a-position. The &&cation of the complex mechanism of this reaction has been altempted. II is possibk IO reach corresponding dioncs by desulphurization of the dithioncs.

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