New Simple Polymeric Supports with Hydrazone Linkers for Solid-Phase Synthesis of Ketones and Primary Amines
作者:Ryszard Lazny、Aneta Nodzewska、Karol Wolosewicz
DOI:10.1055/s-2003-42483
日期:——
The preparation of new solid supports with hydrazine anchoring groups and their application to solid-phase synthesis of ketones and primary amines are described. The supports were used for immobilization of ketones, 4-tert-butylcyclohexanone, pentan-3-one, acetone, N-methylpiperidone, N-benzylpiperidone, and tropinone in the form of their hydrazones. The polymer-supported hydrazones were subjected to deprotonation/alkylation procedure (LDA/RX) once or twice. The resulting alkylated products were cleaved off the solid support on treatment with trifluoroacetic acid in tetrahydrofuran providing α-alkylated or α,α′-bisalkylated ketones or were subjected to reductive cleavage with borane in tetrahydrofuran to give β-alkylated or β,β′-bisalkylated primary amines.
本文描述了带有肼固定基团的新型固体载体的制备及其在酮和伯胺固相合成中的应用。这些载体用于酮类的固定化,包括4-叔丁基环己酮、戊-3-酮、丙酮、N-甲基哌啶酮、N-苄基哌啶酮和托品酮,形成它们的腙形式。聚合物支持的腙经过一次或两次的去质子化/烷基化过程(LDA/RX)。所得的烷基化产物在四氢呋喃中用三氟乙酸处理后从固体载体上脱离,生成α-烷基化或α,α′-双烷基化酮,或在四氢呋喃中用硼烷进行还原裂解,得到β-烷基化或β,β′-双烷基化伯胺。