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。