Design of solid supported carbaborane catalyst with the aim of developing latent reactivity and reuse methods

本文以三氟甲磺酸碳硼烷汞为催化剂，开发了一种新型的多相催化剂，该催化剂对芳基烯丙醇环化、N-对甲苯磺酰苯胺基烯丙醇环化、芳基和杂取代1，3-二烯的区域选择性环化异构化、串联碳环化等反应具有较好的催化活性。因为通过普通滤纸过滤反应混合物回收催化剂。此外，回收的催化剂重复使用至少20次而没有显著的活性损失。在回收的催化剂因重复使用而活性降低的情况下，可以通过与2N盐酸反应，然后与三氟甲磺酸银反应来使其重新活化。

We developed a novel heterogeneous catalyst, solid supported carbaboranylmercuric triflate, with the aim of reutilizing it. This solid supported catalyst showed the remarkable reactivities for aryl allyl alcohol cyclization, cyclization of N-tosylanilinoallylic alcohols, regioselective cycloisomerization of aryl- and hetero-substituted 1,3-dienes, tandem carbocyclization, and etc. The workup of these reactions was very simple, as the catalyst was recovered by filtration of the reaction mixture through ordinary filter paper. Moreover, the recovered catalyst was reused without significant loss of activity at least 20 times. In the case of decreasing the activity of the recovered catalyst through the process of reuse, it could be reactivated via the reaction with 2N hydrochloric acid and then silver triflate.