The preparation and application of three new solid supports with piperazine-derived hydrazine anchoring groups are described. The supports were used for immobilization of ketones. The ketones: cyclohexanone, 4-tert-butylcyclohexanone, 3-pentanone and tropinone, which were bound to polymers in the form of their hydrazones, were deprotonated with LDA and alkylated with propyl iodide or benzyl bromide. The resulting alkylated products were cleaved off the solid support on treatment with trifluoroacetic acid in dichloromethane. Linkers with 6- and 3-carbon atom spacers gave better results than the simple N-aminopiperazine linker.
本文描述了三种新型固体支架的制备和应用,这些支架具有源自
哌嗪的
肼锚定基团。所述支架用于酮的固定化。酮包括
环己酮、
4-叔丁基环己酮、
3-戊酮和
托品酮,这些酮以
肼酮的形式与聚合物结合,经过
LDA去质子化后,用丙基
碘或苄基
溴进行烷基化。得到的烷基化产物用
三氟乙酸在
二氯甲烷中处理后从固体支架上断裂。具有6个和3个碳原子间隔的连接器效果优于简单的N-
氨基
哌嗪连接器。