Mesoions and ketene valence isomers. Pyrrolo[1,2-a]pyridinylium olates and (2-pyridyl)carbonylketenes †
作者:Xuan Ye、John Andraos、Hervé Bibas、Ming Wah Wong、Curt Wentrup
DOI:10.1039/a906831g
日期:——
The zwitterionic title compounds 5a–d are obtained by FVT of picolinoylacetates 3a–d. Compounds 5a–d undergo nucleophilic addition reactions by C–N bond cleavage to afford pyridine derivatives 6–12. The thermal and photochemical ring opening of 5a to the ketene valence isomer 4a is demonstrated by matrix isolation IR spectroscopy and supported by excellent agreement with DFT calculations.
通过对吡啶酰基乙酸酯 3a-d 进行 FVT 反应,可以得到齐聚物标题化合物 5a-d。化合物 5a-d 通过 C-N 键裂解发生亲核加成反应,生成吡啶衍生物 6-12。基质分离红外光谱证明了 5a 在热和光化学作用下开环生成烯酮价异构体 4a,并且与 DFT 计算结果非常吻合。