The present invention relates to a method of producing a platinum (II) complex represented by the formula (A) below characterized by reacting a dichloroplatinum (II) complex represented by the formula (B) below and a tetronic acid derivative represented by the formula (C) below in coexistence with a silver salt and a barium salt.
[in formulae (A) and (C), R1 represents a lower hydrocarbon group having 1 to 3 carbon atoms, and R2 and R3 each represents a hydrogen atom or a lower hydrocarbon group having 1 to 3 carbon atoms]. The present invention also relates to a method in which trans-1,2-diaminocyclohexane as a raw material for a platinum (II) complex is mixed with an acid having no optically active point, and resultant salt is recrystallized from a water-soluble organic solvent or a mixed solvent of water and a water-soluble organic solvent to obtain tans-1,2-diaminocyclohexane having high optical purity in high yield.
本发明涉及一种生产下式(A)所代表的
铂(II)络合物的方法,其特征在于将下式(B)所代表的
二氯铂(II)络合物和下式(C)所代表的
四酸衍
生物与
银盐和
钡盐共存反应。
[在式(A)和(C)中,R1 代表具有 1 至 3 个碳原子的低级烃基,R2 和 R3 分别代表氢原子或具有 1 至 3 个碳原子的低级烃基]。本发明还涉及一种方法,在该方法中,作为
铂(II)络合物原料的反式-
1,2-二氨基环己烷与无光学活性点的酸混合,并从
水溶性有机溶剂或
水与
水溶性有机溶剂的混合溶剂中重结晶所得盐,从而高产率地获得具有高光学纯度的反式-
1,2-二氨基环己烷。