Protic ionic liquid [TMG][Ac] as an efficient, homogeneous and recyclable catalyst for Boc protection of amines
作者:Jafar Akbari、Akbar Heydari、Leila Ma’mani、Seyed Hassan Hosseini
DOI:10.1016/j.crci.2009.10.003
日期:2010.5
Résumé An efficient and practical protocol for the chemoselective N-Boc protection of various structurally different aryl, aliphatic and heterocyclic amines was carried out with (Boc)2O using protic 1, 1, 3, 3-tetra-methylguanidinium acetate (10 mol%) as recyclable catalyst under solvent free condition at ambient temperature. No competitive side reactions (isocyanate, urea and N, N-di-Boc) were observed. α-Amino alcohols afforded the N-Boc-derivative without oxazolidinone formation.
简历
一种高效且实用的化学选择性N-Boc保护各种结构不同的芳基、脂肪族和杂环胺的协议,通过在无溶剂条件下使用质子化的1,1,3,3-四甲基胍乙酸盐(10 mol%)作为可回收催化剂,在室温下使用(Boc)2O进行。未观察到竞争性的副反应(异氰酸酯、脲和N,N-二Boc)。α-氨基醇提供了N-Boc衍生物而不形成噁唑烷酮。