Synthesis of new 2<i>H</i>,4<i>H</i>-benzopyrano[3,4-<i>b</i>]yridine-1,3,5-trione derivatives<i>via</i>carbon suboxide
作者:Leonardo Bonsignore、Giuseppe Loy
DOI:10.1002/jhet.5570350122
日期:1998.1
The new 2H,4H-[1]benzopyrano[3,4-b]pyridine-1,3,5-trione derivatives 10a-f were prepared in the following three steps: first the preparation of new N-(tert-butoxycarbonyl)-3-amino-2H-1-benzopyran-2-one derivatives 5a-f by reaction of coumarin-3-carboxylic acids and diphenylphosphorylazide, then hydrolysis of 5a-f with gaseous hydrogen chloride to give the corresponding amines 7a-f, and finally the
新的2 ħ,4 ħ - [1]苯并吡喃并[3,4- b ]吡啶-1,3,5-三酮衍生物10A-F在以下三个步骤制备:新的第一制备ñ - (叔-通过香豆素-3-羧酸与二苯基磷酰叠氮化物的反应,然后将5a-f与气态氯化氢水解,得到相应的胺7a-(丁氧基羰基)-3-氨基-2 H -1-苯并吡喃-2-酮衍生物5a-f。f,最后在路易斯酸存在下,通过7a-f与亚氧化碳的反应制备10a-f。