Compound (1), ligand of a catalyst complex useful for asymmetric syntheses, is prepared in an economical way by reacting compound (2) with phosphine oxide (3) in the presence of a transition metal/phosphine complex as follows:
where the double line consisting of a continuous line and a dotted line signifies either a double bond or a single bond, respectively forming part of a naphthalene ring or an octahydronaphthalene ring depending on whether the naphthalene ring was subjected to the reduction or not; Tf represents a trifluoromethanesulfonyl group; and Ar represents a phenyl group, a substituted phenyl group (bearing 1 to 3 substituents which may be the same or different and are selected from the group consisting of halogen atoms, lower alkyl group, lower alkoxy group and halogenated lower alkyl group) or a naphthyl group which may bear a lower alkyl or lower alkoxy substituent).
化合物(1)是一种用于不对称合成的催化剂络合物的
配体,其制备方法是在过渡
金属/膦络合物存在下,以经济的方式使化合物(2)与氧化膦(3)发生如下反应:
其中,由连续线和虚线组成的双线表示双键或单键,根据
萘环是否被还原,分别构成
萘环或八氢
萘环的一部分;Tf 表示三
氟甲磺酰基;Ar 代表苯基、取代苯基(可带有 1 至 3 个相同或不同的取代基,这些取代基可选 自卤素原子、低级烷基、低级烷氧基和卤代低级烷基组成的组中)或可带有低级烷基 或低级烷氧基取代基的
萘基。)