A process for preparing substantially pure trans-5-chloro-2-methyl-2,3,3a42b4etrahydro-lH-dibenz[2,3:6,7]oxepino[4,5-c]pyrrole (Asenapine) of formula (I) is provided. The salts of intermediates useful for preparing Asenapine of formula (I) i.e. 5-nitro-2-methyl-2,3,3a,12b-tetrahydro-lH-dibenz [2,3:6,7] oxepino [4,5-c]pyrrole of formula (VIII) and 5-amino-2-methyl-2,3,3a,12b-tetrahydro-lH-dibenz[2,3:6,7]oxepino[4,5-c]pyrrole of formula (DC) are also provided.
提供了一种制备基本纯的式(I)的反式-5-
氯-2-甲基-2,3,3a42b4-四氢-1H-二苯并[2,3:6,7]氧杂-4,5-c-
哌嗪的方法。还提供了制备式(I)的中间体的盐,即式(VIII)的5-硝基-2-甲基-2,3,3a,12b-四氢-1H-二苯并[2,3:6,7]氧杂-4,5-c-
哌嗪和式(DC)的5-
氨基-2-甲基-2,3,3a,12b-四氢-1H-二苯并[2,3:6,7]氧杂-4,5-c-
哌嗪。