This invention relates to novel compounds of general formula (I): ##STR1## wherein the two R.sup.1 groups are identical lower alkyl groups or together form a lower alkylene group; R.sup.2 and R.sup.3 are both different and are selected from hydrogen atoms or organic groups; X and X', which may be the same or different, are selected from O, S and NR, where R represents an organic group; and the asterisk denotes that the configurations of R.sup.2 and R.sup.3 are such that the compound (I) is in substantially enantiomerically pure 4R- or 4S-form. The compounds are useful chiral auxiliaries to which a wide range of, for example, acyl groups containing prochiral centers may be readily and reversibly coupled to the 3-position amino group.
本发明涉及一种新型化合物,其一般式为(I):##STR1## 其中两个R1基团是相同的低碳基基团或共同形成一个低碳基烷基基团;R2和R3都不同,可选择氢原子或有机基团;X和X'可以相同也可以不同,可选择O、S和NR,其中R代表有机基团;星号表示R2和R3的构型使得化合物(I)基本上是对映异构体纯度为4R或4S形式。这些化合物是有用的手性辅助剂,可以将广泛的含有原子中心的丙酰基基团轻松可逆地耦合到3位
氨基基团上。