作者:Alan R. Katritzky、Roland T. Langthorne、Ranjan C. Patel、Gerard Lhommet
DOI:10.1016/s0040-4020(01)88894-3
日期:1981.1
Pyridiniums derived from amino alcohols cyclise to ethers or rearrange to aldehydes on heating. Monopyridiniums from diamines can be acylated or converted into ureas or thioureas: these products cyclise on heating in solution to give dihydro-thiazoles, -4H-thiazines, -oxazoles, -4H-oxazines, or tetrahydro-3H-thiazepines.
衍生自氨基醇的吡啶鎓在加热时会环化为醚或重排为醛。来自二胺的单吡啶鎓可被酰化或转化为脲或硫脲:这些产物在溶液中加热后环化,得到二氢噻唑,-4H-噻嗪,-恶唑,-4H-恶嗪或四氢-3H-噻嗪类。