作者:Christopher M. Sharland、Jirada Singkhonrat、Muhammad NajeebUllah、Simon J. Hayes、David W. Knight、Damian G. Dunford
DOI:10.1016/j.tetlet.2011.02.085
日期:2011.5
We have discovered that a wide range of 3-alkynyl-hydroxyalkanamine derivatives undergo 5-endo-dig cyclisations when exposed to silver nitrate supported on silica gel. Subsequent in situ dehydration of the resulting and sometimes isolable hydroxy-dihydropyrroles leads to pyrroles in essentially quantitative yields using this recoverable and reusable heterogeneous catalyst.
作者:Damian G. Dunford、David W. Knight、Robert C. Wheeler
DOI:10.3998/ark.5550190.0013.717
日期:——
Copper-catalysed cyclisations of β-hydroxyhomopropargylic sulfonamides can be carried out using copper(II) acetate in hot toluene to provide generally excellent yields of the corresponding pyrroles.
可以在热甲苯中使用乙酸铜 (II) 进行 β-羟基高炔丙基磺酰胺的铜催化环化,以提供通常极好的相应吡咯产率。