作者:Mark E. Wilson、James S. Nowick
DOI:10.1016/s0040-4039(98)01396-3
日期:1998.9
This paper reports an efficient synthesis of N-alkyl-N,N′-linked oligoureas [NRCONHCH2CH2]n, which involves the repetition of three steps: (1) main-chain extension by ring-opening of N-(2-nitrobenzenesulfonyl)-2-imidazolidone (1) by a secondary amine RR′NH to afford sulfonamide RR′NCONHCH2CH2NHSO2Ar (2) side-chain attachment by N-alkylation of the sulfonamide with alkyl halide R″X, and (3)
本文报道的有效合成Ñ -烷基- N,N' -连接的oligoureas [NRCONHCH 2 CH 2 ] Ñ,它涉及三个步骤的重复:(1)主链延伸通过的开环ñ - (2-硝基苯磺酰基)-2-咪唑烷酮(1)由仲胺RR'NH,得到磺酰胺RR'NCONHCH 2 CH 2 NHSO 2 AR(2)侧由α链附着ñ与烷基卤R“X,和(3)除去磺酰基的磺酰胺的烷基化,得到一个新的仲胺RR'NCONHCH 2 CH 2NHR”)。通过该方法,分十步制备了四脲,总产率为58%。