从5-芳基偶氮-6-亚芳基肼基-构筑吡嗪并[5,4- e ]-为-三嗪,嘌呤,v-三唑-[4,5- d ]嘧啶和吡唑并[3,4- d ]嘧啶环1,3-二甲基尿嘧啶†
摘要:
通过用重氮化的芳胺处理6-芳基-亚氨基肼基-1,3-二甲基尿嘧啶(I)制备的5-芳基偶氮-6-亚芳基肼基-1,3-二甲基尿嘧啶(II)与二甲基甲酰胺二甲基缩醛反应形成以嘧啶[5,4- e ]-为-三嗪(V)体系,而II的热解导致嘌呤(X),v-三唑并[4,5- d ]嘧啶(XII)和吡唑并[ 3,4- d ]嘧啶(XIV,XIX)系统代替了预期的V。已提出了在这些反应中形成各种环系统的合理机理。
YONEDA F.; MATSUMOTO S.; SAKUMA Y.; FUKAZAWA S., J. CHEM. SOC. PERKIN TRANS. PART 1 <JCPK-BH> 1975, NO 19, 1907-1909
作者:YONEDA F.、 MATSUMOTO S.、 SAKUMA Y.、 FUKAZAWA S.
DOI:——
日期:——
Photocatalytic Oxidative [2+2] Cycloelimination Reactions with Flavinium Salts: Mechanistic Study and Influence of the Catalyst Structure
作者:Tomáš Hartman、Martina Reisnerová、Josef Chudoba、Eva Svobodová、Nataliya Archipowa、Roger Jan Kutta、Radek Cibulka
DOI:10.1002/cplu.202000767
日期:2021.3
and investigated their application in light‐dependent oxidative cycloelimination of cyclobutanes. Detailed mechanistic investigations with a coumarin dimer as a model substrate reveal that the reaction preferentially occurs via the triplet‐born radical pair after electron transfer from the substrate to the triplet state of an alloxazinium salt. The very photostable 7,8‐dimethoxy derivative is a superior
Construction of pyrimido[5,4-<i>e</i>]-<i>as</i>-triazine, purine,<i>v</i>-triazolo-[4,5-<i>d</i>]pyrimidine and pyrazolo[3,4-<i>d</i>]pyrimidine ring systems from 5-arylazo-6-arylidenehydrazino-1,3-dimethyluracils
Reaction of 5-arylazo-6-arylidenehydrazino-1,3-dimethyluracils (II), prepared by the treatment of 6-aryl-idenehydrazino-1,3-dimethyluracils (I) with diazotized arylamines, with dimethylformamide dimethylacetal resulted in the formation of pyrimido[5,4-e]-as-triazine (V) system, while the thermolysis of II resulted in the formation of purine (X), v-triazolo[4,5-d]pyrimidine (XII), and pyrazolo[3,4-d]pyrimidine
通过用重氮化的芳胺处理6-芳基-亚氨基肼基-1,3-二甲基尿嘧啶(I)制备的5-芳基偶氮-6-亚芳基肼基-1,3-二甲基尿嘧啶(II)与二甲基甲酰胺二甲基缩醛反应形成以嘧啶[5,4- e ]-为-三嗪(V)体系,而II的热解导致嘌呤(X),v-三唑并[4,5- d ]嘧啶(XII)和吡唑并[ 3,4- d ]嘧啶(XIV,XIX)系统代替了预期的V。已提出了在这些反应中形成各种环系统的合理机理。