The invention provides a process for preparing single enantiomers of compounds represented by the formula :
and chiral acid addition salts thereof ;
wherein :
X and Y are independently hydrogen ; lower alkyl ; lower alkoxy; or halo; or X and Y taken together is methylenedioxy or ethylene-1,2-dioxy;
which includes reduction of a compound represented by the formula :
to give a mixture of stereoisomers represented by the formula :
wherein each wavy line independently represents a bond in either the α or β position ;
followed by dissolving the mixture of stereoisomers and a chiral resolving acid in a suitable solvent and allowing the solution to crystallize, giving a salt of the desired enantiomer.
本发明提供了一种制备由式......表示的化合物的单一对映体的工艺:
及其手性酸加成盐的工艺;
其中:
X和Y独立地为氢;低级烷基;低级烷氧基;或卤素;或X和Y合起来为亚甲基二氧基或
乙烯-1,2-二氧基;
其中包括还原由式:
式所代表的化合物进行还原,得到由式所代表的立体异构体混合物:
其中每条波浪线独立地代表 α 或 β 位置上的键;
然后将立体异构体混合物和手性溶解酸溶解在合适的溶剂中,使溶液结晶,得到所需对映异构体的盐。