On the reactivity of pyrido[3′,2′:4,5]furo(thieno)[3,2-d]pyrimidin-7(8)-ones with some alkyl mono- and di-halides: synthesis of new heterocyclic systems containing thiazolo[3,2-a]pyrimidine and pyrimido[2,1-b]thiazine moiety
作者:Samvel N. Sirakanyan、Domenico Spinelli、Athina Geronikaki、Anush A. Hovakimyan
DOI:10.1016/j.tet.2015.07.069
日期:2015.10
2-d][1,3]thiazolo[3,2-a]pyrimidin-7(8)-ones 6 and furo(thieno)[3′,2′:4,5]pyrimido[2,1-b][1,3]thiazin-7(8)-ones 7. Moreover compounds 3 by alkylation with p-chlorophenacyl bromide (again a bifunctional reagent) led to the formation of the corresponding S-alkylated compounds 9, whose cyclization furnished structural analogues of compounds 6: p-chlorophenyl-substituted thiazolo[3,2-a]pyrimidin-7(8)-ones 10
1-氨基呋喃(硫杂)[2,3 - b ]吡啶-2-羧酸乙酯1与苯甲酰基异硫氰酸酯反应,生成相应的硫脲基衍生物2,其在氢氧化钾作用下的分子内环化作用提供了相关的9(10)-噻吩基吡啶并[3',2':4,5]呋喃(thieno)[3,2 - d ]嘧啶-7(8)-ones 3。具有碘甲烷的化合物3可以得到S-甲基4和S,N-二甲基5衍生物。有趣的是3通过用二氯化烷基化物(双功能试剂)进行烷基化,在嘧啶环[ a ]侧环化为噻唑啉或噻嗪环,并形成新的五环系统:furo(thieno)[3,2- d ] [1,3] thiazolo [3,2- a ]嘧啶-7(8)-ones 6和呋喃(thieno)[3',2':4,5] pyrimido [2,1- b ] [1,3 ] thiazin-7(8)-ones 7。此外,通过用对氯苯甲酰基溴(再次是双功能试剂)烷基化化合物3,导致形成相应的S-烷基化