3-substituted-1,2,4-oxadiazolin-5-one; A useful amidine precursor and protecting group
作者:Richard E Bolton、Steven J Coote、Harry Finch、Andrew Lowdon、Neil Pegg、M Victoria Vinader
DOI:10.1016/0040-4039(95)00755-2
日期:1995.6
5-Benzyloxy-1,2,4-oxadiazoles and 1,2,4-oxadiazolin-5-ones are useful precursors to, and protecting groups for the amidine moiety. The latter compounds are readily prepared from amidoximes or alternatively via cycloaddition of nitrile oxides to trichloroacetonitrile and subsequent hydrolysis. Both protecting groups may be readily removed upon hydrogenation, liberating the parent amidine. In addition
5-苄氧基-1,2,4-恶二唑和1,2,4-恶二唑啉-5-酮是the部分的有用的前体和保护基团。后者的化合物可以很容易地由ox胺肟制得,也可以通过将腈氧化物环加成到三氯乙腈中并随后水解而制得。氢化后,两个保护基很容易除去,从而释放出母体am。另外,可以将1,2,4-恶二唑啉-5-酮用于N-烷基am的容易的合成。