1,1,1,3,3,3-Hexafluoroisopropanol: A Recyclable Organocatalyst for<i>N</i>-Boc Protection of Amines
作者:Akbar Heydari、Samad Khaksar、Mahmood Tajbakhsh
DOI:10.1055/s-2008-1067272
日期:2008.10
A simple and efficient protocol for the chemoselective mono-N-Boc protection of various structurally diverse amines with di-tert-butyl dicarbonate using 1,1,1,3,3,3-hexafluoroisopropanol (HFIP) as solvent and catalyst is described. The catalyst can be readily separated from the reaction products and recovered for direct reuse. No competitive side reactions such as formation of isocyanate, urea, and N,N-di-Boc were observed. α-Amino alcohols afforded the N-Boc derivatives without oxazolidinone formation.
描述了一种简单且高效的化学选择性单-N-Boc保护多种结构多样性胺类的方法,使用二叔丁基二碳酸酯和1,1,1,3,3,3-六氟异丙醇(HFIP)作为溶剂和催化剂。催化剂可以轻易地从反应产物中分离并回收,以便直接重复使用。未观察到异氰酸酯、脲和N,N-二-Boc等竞争性副反应。α-氨基醇类在未形成恶唑烷酮的情况下获得了N-Boc衍生物。