An unusual radical smiles rearrangement

An unusual radical smiles rearrangement
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DOI:
10.1021/ol051568l
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发表时间:
2005-08-18
期刊:
影响因子:
5.2
通讯作者:
Zard, SZ
Zard, SZ
中科院分区:
化学1区
文献类型:
--
作者:
Bacqué, E;El Qacemi, M;Zard, SZ

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由N-(α -黄原基)乙酰苯胺或N-(α -黄原基)乙酰氨基吡啶衍生的自由基在氮旁边具有取代基,通过一个四元环进行迄今未记载的Smiles重排过程。还发现,在一定条件下,由四元环中间体裂解产生的酰胺基自由基可发生断裂,生成异氰酸酯。在苯或氯苯回流的温度下,这种碎片是前所未有的。
Radicals derived from N-(alpha-xanthyl)acetanilides or N-(alpha-xanthyl)acetylaminopyridines possessing a substituent next to the nitrogen undergo a hitherto undocumented Smiles rearrangement proceeding through a four-membered ring. It was also found that under certain conditions the amidyl radical produced by cleavage of the four-membered ring intermediate can undergo fragmentation to give an isocyanate. Such fragmentations are unprecedented at temperatures corresponding to refluxing benzene or chlorobenzene.