碱性胺是许多具有生物活性的天然产物和药物的关键元素。鉴于其固有的反应性,在靶向合成过程中通常需要保护碱性胺,这会导致保护/脱保护序列的浪费。我们报告了一种分步经济的方法,能够在仲胺通过 CO 2的正式挤出转化为叔胺之前将其保护为氨基甲酸酯。该方法适用于 iboga 生物碱 (±)-conodusine A 和 (±)-conodusine B 的合成。
作者:Alastair A. Cant、Guillaume H. V. Bertrand、Jaclyn L. Henderson、Lee Roberts、Michael F. Greaney
DOI:10.1002/anie.200901410
日期:2009.6.29
Adding an aryne to a tertiary allylamine affords o‐allylaniline products of an aza‐Claisenrearrangement. The aryne simultaneously provides the π component for the rearrangement and the quaternization event that lowers the activation energy for the sigmatropic shift. The reaction was applied to the synthesis of medium‐ring benzannulated amines (see scheme).
A General Nickel-Catalyzed Hydroamination of 1,3-Dienes by Alkylamines: Catalyst Selection, Scope, and Mechanism
作者:Jan Pawlas、Yoshiaki Nakao、Motoi Kawatsura、John F. Hartwig
DOI:10.1021/ja017575w
日期:2002.4.1
of the thermodynamics favoring the reaction of a nickel allyl with an amine to form an allylic amine, the thermodynamics favored reaction of a nickel(0) complex with allylic amine in the presence of acid to form a Ni(II) allyl. The realization of these thermodynamics led us to the discovery that nickel and some palladium complexes in the presence or absence of acid catalyze the exchange of the amino