Synthesis, Properties, and Oxidizing Ability of 9,11-Dimethylbenzocyclohepta[6,7-<i>b</i>]pyrimido[5,4-<i>d</i>]furan- 10(9<i>H</i>),12(11<i>H</i>)-dionylium Tetrafluoroborate
作者:Shin-ichi Naya、Takeshi Tokunaka、Makoto Nitta
DOI:10.1021/jo035274u
日期:2003.11.1
condensation reaction of 2-methoxybenzo[d]tropone with dimethylbarbituric acid and a subsequent cyclization reaction by using 42% aq HBF4. The X-ray crystal analysis and MO calculation were carried out to clarify the structural characteristics. Properties of the cation 11 were studied by the pKR+ value (4.7) and reduction potentials (-0.46 and -1.07 V vs Ag/AgNO3) as well as the reaction with some nucleophiles
新型9,11-二甲基苯并环庚[6,7-b]嘧啶[5,4-d]呋喃-10(9H),12(11H)-二氟四氟硼酸11 * BF4-的便利制备是由苯并[[]] d]托普酮与二甲基巴比妥酸,然后通过使用DDQ-Sc(OTf)3进行氧化环化反应或在有氧条件下进行光辐照。还可以通过2-甲氧基苯并[d]托普酮与二甲基巴比妥酸的缩合反应和随后通过使用42%HBF 4水溶液的环化反应来完成11 * BF4-的替代合成。进行了X射线晶体分析和MO计算以阐明结构特征。通过pKR +值(4.7)和还原电位(相对于Ag / AgNO3的还原电位(-0.46和-1.07 V)和与某些亲核试剂的反应)研究了阳离子11的性质。