CH2Cl2 as reagent in the synthesis of methylene-bridged 3,3′-bis(oxazolidin-2-one) derivatives under ambient conditions
作者:Qingfeng Liu、Yansen Zhang、Zhiguo Zhang、Tongxin Liu、Lei Shi、Guisheng Zhang
DOI:10.1039/c4ra03248a
日期:——
This paper describes a highly efficient and facile transformation of substituted oxazolidin-2-ones to methylene-bridged 3,3â²-bis(oxazolidin-2-one) derivatives in a mixture solvent of CH2Cl2 (DCM) and N,N-dimethylformamide (DMF) in the presence of NaH at ambient temperature. Isotopic labeling experiments indicated that the C of the bridged methylene group was derived from CH2Cl2 instead of DMF and other unknown substances in the NaH reagent (60% dispersion in mineral oil).
本文描述了一种高效简便的方法,将取代的氧杂环戊烷-2-酮转化为在常温下,在CH2Cl2(DCM)和N,N-二甲基甲酰胺(DMF)混合溶剂中,存在NaH的情况下,形成亚甲基桥连的3,3'-双(氧杂环戊烷-2-酮)衍生物。稳定同位素标记实验表明,桥连亚甲基的碳源自CH2Cl2,而非DMF或NaH试剂(在矿物油中的60%分散液)中的其它未知物质。