Novel phenanthro[9,10-d]pyrimidines and phenanthro[9,10-d][1,2]oxazoles are regioselectively prepared by the application of a straightforward synthetic pathway, starting from new o,o′-dihalogenated and non-halogenated 4,5-diarylpyrimidines and 4,5-diarylisoxazoles, respectively, prepared via a tandem amine exchange/heterocyclization of diarylenaminones. A comparative study of biaryl coupling methodologies
新型菲[9,10- d ]嘧啶和菲[9,10- d ] [1,2]恶唑是通过从新的o,o开始的直接合成途径进行区域选择性制备的经由串联芳胺交换/二芳基氨基酮制备的′-二卤代和非卤代4,5-二芳基嘧啶和4,5-二芳基异恶唑。对联芳基偶联方法的比较研究提供了两个高效,互补的程序来完成最后的偶联步骤:分子内的Stille-Kelly卤代二芳基嘧啶和二芳基异恶唑的甲锡烷基化/偶联,以及相应非磷酸酯基的PIFA介导的非酚氧化偶联卤化的底物。此外,还研究了针对相同目标四环系统的其他替代方法。
A Combination of Tandem Amine-Exchange/Heterocyclization and Biaryl Coupling Reactions for the Straightforward Preparation of Phenanthro[9,10-<i>d</i>]pyrazoles
The tandem amine-exchange/heterocyclization of enaminoketones is successfully applied to the regioselective preparation of a series of new 4,5-diarylpyrazoles by reaction of phenylhydrazine and several 3-N,N-(dimethylamino)-1,2-diarylpropenones. The comparison of a vast array of biaryl coupling procedures provides general, complementary approaches to new phenanthro[9,10-d]pyrazoles. The most efficient
New 4,5-o,o-dihaloarylpyrimidines, readily obtained from the corresponding enaminoketones, are transformed into phenanthro[9,10-d]pyrimidines by means of a high-yielding tandem stannylation/biaryl coupling procedure. Proof of the pyrimidine formation mechanism is also presented.
容易地从相应的烯氨基酮获得的新的4,5- o,o-二卤代芳基嘧啶通过高产率的串联甲锡烷基化/联芳基偶联方法转化为菲咯啉[ 9,10- d ]嘧啶。还提供了嘧啶形成机理的证明。