A process for the preparation of a compound of the formula ##STR1## which comprises deprotonating a carbamate of the formula ##STR2## in an inert solvent with a selective base, in the presence of a chelate-forming diamine to give a compound of the formula ##STR3## and then reacting III in an inert solvent, either with an achiral electrophile of the formula (IV) or (V) or with an optionally prochiral electrophile of the formula (VI) ##STR4## and in the case in which R.sup.1 represents an electrofugic leaving group, optionally again electrophilically substituted with the formation of an acyl anion and renewed deprotonation, and in a last step, solvolytically removing the protecting group --CO--NR.sup.10 R.sup.11.
一种制备式为##STR1##化合物的方法,包括在惰性溶剂中使用选择性碱剂去质子化式为##STR2##的
氨基甲酸酯,在
螯合剂型二胺的存在下,得到式为##STR3##的化合物,然后在惰性溶剂中,与式为(IV)或(V)的非手性亲电试剂或与式为(VI)的可选非手性亲电试剂反应,如果R.sup.1代表电离子离开基,则可以再次电离性取代形成酰阴离子和再生去质子化,最后一步,通过溶解去除保护基--CO--NR.sup.10 R.sup.11。