Process for preparing and using guanidine derivatives

摘要

<IMAGE> wherein R is a substituted or unsubstituted hydrocarbon residue or acyl group; X is an electron withdrawing group; Y1 and Y2, which are the same or different, are each independently oxygen or sulfur; and A is a substituted or unsubstituted, divalent hydrocarbon residue have potent reactivity, this being useful in preparing guanidine derivatives.