abstract |
(57) [Summary] [Object] To provide a novel nitrogen-containing compound useful as an amino group-protecting agent. [Structure] The following formula (I): (R is an alkyl group, an aryl group or an aralkyl group, X is an oxygen atom or a sulfur atom, and n is 2 or 3.), for example, 1,3-di Benzyloxycarbonyl-2-imidazolidinethione, 1,3-di-t-butoxycarbonyl-2-imidazolidinethione. |