Reactions with 2-mercaptopyrimidines. Synthesis of some new thiazolo[3,2-<i>a</i>]- and triazolo[4,3-<i>a</i>]pyrimidines
作者:S. M. Hussain、A. M. El-Reedy、A. M. Hassan Rezk、Kh. A. Sife El-Dien
DOI:10.1002/jhet.5570240621
日期:1987.11
afforded the S-alkyl derivatives IIa-c. 2-Carboxymethylthio and 2-(2′,4′-dioxopentan-3-ylthio) derivatives IIb and IIc could be cyclised by acetic anhydride or polyphosphoric acid to give 6-cyano-3,5-dioxo-5H-7-phenylthiazolo[3,2-a]pyrimidine III and 2-acetyl-6-carboxamido-5H-3-methyl-7-phenylthiazolo[3,2-a]pyrimidine-5-one IX, respectively. Benzoylation of 2-hydrazinopyrimidine derivative XII, in anhydrous
5-氰基-4-氧代-6-苯基-2-硫代-1,2,3,4-四氢嘧啶Ⅰ与甲基碘,氯乙酸或3-氯-2,4-戊二酮烷基化,得到S-烷基衍生物IIa-c。2-羧甲硫基和2-(2',4'-二氧戊烷-3-基硫基)衍生物IIb和IIc可通过乙酸酐或多磷酸环化得到6-氰基-3,5-二氧代-5 H -7-苯基噻唑[3,2- a ]嘧啶III和2-乙酰基-6-羧酰胺基-5 H -3-甲基-7-苯基噻唑并[3,2 - a ]嘧啶-5-one IX。2-肼基嘧啶衍生物XII的苯甲酰化作用在无水二恶烷,得到Ñ -苯甲酰基衍生物XIII,这可以通过在二甲基甲酰胺中加热环化,得到5-氨基-6-氰基-3,7-二苯基-小号-三唑并[4,3-一个]嘧啶(XIV)。2-肼基嘧啶衍生物XII和XV在二恶烷中与异硫氰酸苯甲酰基酯反应,生成4-苯甲酰基硫代氨基脲化合物XVI和XVII,它们分别被转化为2- s-三唑并嘧啶衍生物XVII