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    • 1. 发明授权
    • Regeneration of 2,2′-cyclopropylidene-bis (oxazolines)
    • 2,2'-亚环丙基 - 双(恶唑啉)的再生
    • US08846944B2
    • 2014-09-30
    • US12998818
    • 2009-11-30
    • Ivars KalvinshAntons LebedevsAleksandrs ChernobrovijsGrigory VeinbergMaksims VoronaAgnija Ievina
    • Ivars KalvinshAntons LebedevsAleksandrs ChernobrovijsGrigory VeinbergMaksims VoronaAgnija Ievina
    • C07D263/62
    • C07D263/62C07D263/14C07D263/60
    • 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-[1,2-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.
    • 本发明提供了手性2,2'-亚环丙基 - 双(恶唑啉)再生的方法,例如(3',R“,3'R”,8aS,8'aS)-2,2'-亚环丙基双[3a,8a] - 二氢-8H-茚并 - [1,2-d] - 恶唑和(45,4'5,5R,5'R)-2,2'-亚环丙基双-4,5-二苯基二氢-4,5-恶唑, 用作例如复合催化剂的一部分 通过在吸附剂如硅胶上选择性吸附2,2'-亚环丙基 - 双(恶唑啉),从反应混合物中,立体选择性加成反应,从反应混合物中分离吸附剂,解吸2,2'-亚环丙基 - 双(恶唑啉)由吸附剂与合适的有机溶剂反应,并从用于解吸过程的有机溶剂中最终回收2,2'-亚环丙基 - 双(恶唑啉)。 回收的化合物的催化质量与新鲜制备的催化剂中的催化质量没有不同。