Electrophilic Cyclization of Allylic 1,1- Dimethylisoureas with N-Iodosuccinimide and Phenylselenenyl Triflate
作者:Robert M. Giuliano、Carol Bigos
DOI:10.1080/00397919508012678
日期:1995.4
Abstract New procedures are described for the cyclization of allylic 1, 1-dimethylisoureas. Efficient cyclization of the isoureas to give substituted oxazolines occurs with both N-iodosuccinimide and phenylselenenyl triflate. Reductive dehalogenation can be carried out with lithiumaluminumhydride.
Electrophilic Cyclization and Thermal Rearrangement of Allylic 1,1-Dimethylisoureas
作者:Robert M. Giuliano、Tien T. Duong、Ted W. Deisenroth、Wayne G. Mcmahon、Walter J. Boyko
DOI:10.1055/s-1991-26388
日期:——
A series of substituted 2-allyl-1,1-dimethylisoureas (allyl N,N-dimethylcarbamimidates) was prepared by the reaction of the corresponding allylic alcohols with dimethylcyanamide in the presence of sodium hydride. Treatment of the isoureas with mercuric acetate in acetonitrile, followed by reduction with sodium borohydride, afforded substituted 4,5-dihydrooxazoles. Thermal rearrangement of the 1,1-dimethylisoureas occurred in refluxing xylene to give trisubstituted ureas.