A polystyrene-supported isothiourea catalyst, based on the homogeneous catalyst HyperBTM, has been prepared and used for the acylative kinetic resolution of secondary alcohols. A wide range of alcohols, including benzylic, allylic, and propargylic alcohols, cycloalkanol derivatives, and a 1,2-diol, has been resolved using either propionic or isobutyric anhydride with good to excellent selectivity factors obtained (28 examples, s values up to 600). The catalyst can be recovered and reused by a simple filtration and washing sequence, with no special precautions needed. The recyclability of the catalyst was demonstrated (15 cycles) with no significant loss in either activity or selectivity. The recyclable catalyst was also used for the sequential resolution of 10 different alcohols using different anhydrides with no cross-contamination between cycles. Finally, successful application in a continuous flow process demonstrated the first example of an immobilized Lewis base catalyst used for the kinetic resolution of alcohols in flow.

中文翻译：

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分批和流动地使用可回收聚合物负载的异硫脲催化剂对醇的酰基化动力学拆分

已经制备了基于均相催化剂HyperBTM的聚苯乙烯负载的异硫脲催化剂，并将其用于仲醇的酰基动力学拆分。宽范围的醇，包括苄基，烯丙基，和炔丙基醇，环烷醇衍生物，和1,2-二醇的，已使用或者丙酸或异丁酸酐以良好到获得优异的选择性因子（28个实施例中，解决了小号值最大为600）。催化剂可以通过简单的过滤和洗涤程序进行回收和再利用，而无需采取特殊的预防措施。证明了该催化剂的可回收性（15个循环），活性或选择性均无明显损失。可循环使用的催化剂还用于使用不同的酸酐顺序拆分10种不同的醇，各循环之间无交叉污染。最后，在连续流工艺中的成功应用证明了用于流态醇动力学分离的固定化Lewis碱催化剂的第一个实例。