(2R,5S) and (2S,5S)-2-hydroxymethyl-5-alkyl piperazines 1–5 were prepared in good yields without any racemization. The use of these compounds as chiral catalysts for the enantioselective addition of diethylzinc to aldehydes is described. This paper reports the first example of the use of piperazine methanols in asymmetric synthesis.
从对映体纯的
丝氨酸开始,以高收率制备了一系列(2 R,5 S)和(2 S,5 S)-2-羟甲基-5-烷基
哌嗪1-5,没有任何消旋作用。描述了将这些化合物用作手性催化剂以将
二乙基锌对映异构地加成到醛中。本文报道了在不对称合成中使用
哌嗪甲醇的第一个实例。