Gold(I)-Catalyzed Intramolecular Dihydroamination of Allenes with <i>N</i>,<i>N</i>′-Disubstituted Ureas To Form Bicyclic Imidazolidin-2-ones
作者:Hao Li、Ross A. Widenhoefer
DOI:10.1021/ol900730w
日期:2009.6.18
mixture of gold(I) N-heterocyclic carbene complex (5)AuCl [5 = 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidine] and AgPF6 at room temperature for 2 h led to isolation of bicyclic imidazolidin-2-one 4 in 93% yield with ≥98% diastereomeric purity. Gold-catalyzed dihydroamination was effective for a number of N-δ- and N-γ-allenyl ureas to form the corresponding bicyclic imidazolidin-2-ones in good yield