The present invention provides a method for regeneration of chiral 2,2'-cyclopropylidene-bis(oxazolines), such as (3&R, 3'aR,8aS,8'aS )-2,2'-cyclopropylidenebis-[3a,8a]-dihydro-8H-indeno-[l,2-d]-oxazole and (45,4'5,5R,5'R )-2,2'-cyclopropylidenebis-4,5-diphenyldihydro-4,5-oxazole, used as a part of complex catalysts for e.g. stereoselective addition reactions, from the reaction mixtures, by selective sorption of 2,2'-cyclopropylidene-bis(oxazolines) on a sorbent, such as silica gel, isolation of the sorbent from reaction mixture, desorption of 2,2'-cyclopropylidene-bis(oxazolines) from the sorbent with suitable organic solvent and final recovery of 2,2'-cyclopropylidene-bis(oxazolines) from the organic solvent used for desorption process. Catalytic quality of recovered compounds does not differ from those in freshly prepared catalysts.
本发明提供了一种再生手性2,2'-环丙基亚甲基双(
噁唑啉)的方法,例如(3&R, 3'aR,8aS,8'aS)-2,2'-环丙基亚甲基双-[3a,8a]-二氢-8H-
茚-[1,2-d]-
噁唑和(45,4'5,5R,5'R)-2,2'-环丙基亚甲基双-4,5-二苯基二氢-4,5-
噁唑,这些化合物是用作复杂催化剂的一部分,用于立体选择性加成反应。该方法通过在吸附剂(例如
硅胶)上选择性吸附2,2'-环丙基亚甲基双(
噁唑啉)、从反应混合物中分离出吸附剂、用适当的有机溶剂从吸附剂中脱附2,2'-环丙基亚甲基双(
噁唑啉)、并从用于脱附过程的有机溶剂中最终回收2,2'-环丙基亚甲基双(
噁唑啉)。回收化合物的催化质量与新鲜制备的催化剂相同。