Synthesis of 7<i>H</i>-tetrazolo[1,5-<i>c</i>]pyrrolo[3,2-<i>e</i>]pyrimidines and their reductive ring cleavage to 4-aminopyrrolo[2,3-<i>d</i>]pyrimidines
作者:Chaitanya G. Dave、Rina D. Shah
DOI:10.1002/jhet.5570350609
日期:1998.11
9-disubstituted 7H-1,2,3,4-tetrazolo[1,5-c]pyrrolo[3,2-e]pyrimidines 5 have been synthesized either by diazotization of 4-hydrazino-5,7-disubstituted-7H-pyrrolo[2,3-d]pyrimidines 4 obtained by hydrazinolysis of 4-chloro-5,7-disubstituted-7H-pyrrolo[2,3-d]pyrimidines 3 or via a substitution reaction between 3 and sodium azide. 5,7-Disubstituted-7H-pyrrolo[2,3-d]pyrimidin-4(3H)-ones 2 were obtained by cyclocondensation
通过4-肼基-5,7的重氮化反应合成了一些新的7,9-二取代的7 H -1,2,3,4-四唑并[1,5- c ]吡咯并[3,2- e ]嘧啶5二取代-7 ħ吡咯并[2,3- d ]嘧啶4通过肼解得到的4-氯-5,7-二取代- 7 ħ吡咯并[2,3- d ]嘧啶3或经由之间的取代反应3和叠氮化钠。5,7-二取代-7 H-吡咯并[2,3- d ]嘧啶-4(3 H)-ones 2通过将2-氨基-3-氰基-1,4-二取代的吡咯1与甲酸进行环缩合反应制得三氯甲烷,用氯氧化氯进行氯化,得到3。已经报道了通过5的还原环裂解合成4-氨基-5,7-二取代的7 H-吡咯并[2,3- d ]嘧啶6的新途径。