Unexpected pyrylium to pyrylium domino transformation. Synthesis of pyrano[3,4-c]pyran-7-ium cation and its recyclization to 2,7-naphthyridine derivative
作者:Konstantin F. Suzdalev、Alina V. Krachkovskaya、Mikhail E. Kletskii、Oleg N. Burov、Artem V. Tatarov、Sergey V. Kurbatov
DOI:10.1007/s10593-017-2033-9
日期:2017.2
6-diphenylpyrylium perchlorate in three steps. Its reaction with triethyl orthoformate was accompanied by rearrangement of the initial pyrylium ring and led to pyrano[3,4-c]pyran-7-ium perchlorate system through a domino process involving ethanol addition-elimination. A plausible mechanism of the reaction is suggested on the basis of DFT quantum-chemical calculations. Reaction of the obtained pyrano[3,4-c]pyran-7-ium
从
高氯酸2,6-二
苯基
吡啶鎓中分三步得到4-乙基-3-甲酰基-2,6-二
苯基
吡啶鎓
高氯酸盐。它与
原甲酸三乙酯的反应伴随有最初的
吡啶鎓环的重排,并通过涉及
乙醇加成消除的多米诺法制得了
吡喃并[3,4- c ]
吡喃-7-
高氯酸钾体系。在DFT量子
化学计算的
基础上,提出了一个合理的反应机理。所获得的
吡喃并[3,4- c ]
吡喃-7-
高氯酸盐与
乙酸铵的反应产生了
2,7-萘啶衍
生物,而没有骨架重排。