α-chlorination procedures. The latter aldehydes proved to be useful starting materials for the stereoselective Staudinger synthesis of (3S,4S)-4-[(1S)-1-chloroalkyl]azetidin-2-ones in high diastereomeric ratios and good overall yields, which were used as chiral building blocks for the preparation of a number of azetidines and pyrrolidines.
从对映体纯的
氨基酸开始,以三步法制备手性短链α-
氯醛,从而为已知的有机催化α-
氯化过程提供了一种实用的合成替代方法。后者被证明是立体异构的施陶丁格以高非对映异构体比例和良好的总收率合成(3 S,4 S)-4-[(1 S)-1-
氯烷基]氮杂
环丁烷-2-酮的有用原料。将其用作制备许多氮杂
环丁烷和
吡咯烷的手性构件。