activated N, N′ disubstituted arylthiohydantoins with methyl or ethyl iodide and sodium methoxide in DMF at room temperature affords the corresponding hydantoins in good yield. The mechanism involves an unusual ring opening-ring closure sequence which can be exploited for a novel (thio) hydantoin to (thio) urea rearrangement.
在室温下在
DMF中用甲基或乙基
碘化物和
甲醇钠处理活化的N,N'二取代的芳基
硫代乙内酰
脲,以良好的收率得到相应的乙内酰
脲。该机制涉及不寻常的开环-开环闭合序列,该序列可用于新的(
硫代)乙内酰
脲至(
硫代)
尿素重排。