Copper(I)-catalyzed coupling reaction of aryl boronic acids with N,O-acetals and N,N-aminals under atmosphere leading to α-aryl glycine derivatives and diarylmethylamine derivatives
摘要:
We demonstrated a copper(I)-catalyzed coupling reaction of aryl boronic acids with N,O-acetals and N,N-aminals leading to the synthesis of alpha-aryl glycines and diarylmethylamines. Under an ambient atmosphere, this catalytic system could be applied to the activation of a C(sp(3))-O bond of N,O-acetals with an ester and an aryl group, or without a coordinating substituent, as well as to a C(sp(3))-N bond of N,N-aminals. (C) 2015 Elsevier Ltd. All rights reserved.
Practical Synthesis of Natural
Amino Acid Derivatives: Hf(OTf)<sub>4</sub>-Catalyzed Mannich-Type
Reaction of Ketene Silyl Acetals or Enol Silyl Ethers with <i>N</i>,<i>O</i>-Acetals
as a Glycine Cation Equivalent
作者:Norio Sakai、Asuka Sato、Takeo Konakahara
DOI:10.1055/s-0029-1216743
日期:——
The authors demonstrated the Hf(OTf) 4 -catalyzed Mannich-type reaction of an enol silyl ether and a ketene silyl acetal with an N,O-acetat leading to the preparation of amino acid derivatives. In particular, use of the N,O-acetal having a bis(trimethylsilyl)amino group directly produced N-unprotected aspartic acid derivatives after a standard aqueous workup.
A practical approach to non-natural or N-unsubstituted α-arylglycine derivatives: Hf(OTf)4-doped Me3SiCl system-catalyzed aminomethylation of electron-rich arenes with a new type of N,O-acetal
demonstrated the Hf(OTf)4-doped Me3SiCl system-catalyzed aminomethylation of electron-richaromaticcompounds, such as indoles and anilines, with new types of N,O-acetals having a variety of functional groups, such as cyano, ester, bis(trimethylsilyl)amino, diallylamino, and cyclic amino moieties, for the preparation of non-natural aromatic amino acid derivatives. Aminomethylation using an N,O-acetal with a
Facile Approach to Natural or Non-Natural Amino Acid Derivatives: Me<sub>3</sub>SiCl-Promoted Coupling Reaction of Organozinc Compounds with N,O-Acetals
O,N‐ bzw. N,N‐Acetale sowie Dialkylimoniumsalze der Glyoxylsäurestufe können für Aminoalkylierungen CH‐acider Verbindungen eingesetzt werden, wobei Amide oder Ester N,N‐dialkylierter α‐Aminosäuren entstehen. Die Reaktion wird an einer Reihe von Beispielen untersucht.
乙醛酸阶段的 O, N- 或 N, N- 缩醛和二烷基亚铵盐可用于 CH-酸性化合物的氨基烷基化,形成 N, N- 二烷基化 α- 氨基酸的酰胺或酯。使用一系列实施例研究该反应。