使用各种各样的杂芳族化合物,钯催化的溴苄基乙酰胺衍生物的直接芳基化使得杂芳基化的苄基乙酰胺非常容易获得。2-,3-和4-溴苄基乙酰胺具有非常相似的反应性。在存在2-取代的呋喃,噻吩,吡咯,噻唑或咪唑的情况下,观察到区域选择性的5-芳基化。苯并恶唑反应得到2-芳基化的化合物。而3,5-二甲基异恶唑得到4-芳基化产物。在大多数情况下,使用PdCl(C 3 H 5)(dppb)作为催化剂,使用KOAc作为碱,使用DMAC作为溶剂的系统可获得较高的偶联产物收率。 钯-交叉偶联反应-芳基化-呋喃-噻吩-吡咯-噻唑-咪唑-苯并恶唑
AlMe3-Promoted Formation of Amides from Acids and Amines
摘要:
In the presence of AlMe3, amines can be directly coupled with acids through dimethylalumlnum amide Intermediates to form the corresponding amides. A wide range of amines and acids including less nucleophilic amines, bulky amines, unprotected secondary amino acids, and acids with poor solubility were coupled smoothly to give the desired products in 55-98% yields.
A Rh(II)- or Ag(I)-Catalyzed Formal C–O Bond Insertion of Cyclic Hemiaminal with Aryl Diazoacetate
作者:Wenhao Hu、Cong Xu、Xiangrong Liu、Xiongda Xie、Lin Deng、Xinfang Xu、Albert S. C. Chan
DOI:10.1055/a-1623-1490
日期:2021.12
This method provides an efficient way to construct six- and seven-membered N-heterocycles containing a biaryl linkage. This reaction features a gem-difunctionalization process of diazo compounds with cyclic hemiaminals, delivering α-hydroxyl-β-amino ester derivatives with a tertiary carbon center through a formal C–O bond-insertion transformation.
Disclosed is a process for producing a benzylamine derivative represented by the general formula (3):
wherein X
1
, R
1
and R
2
are as defined below, which comprises reacting a benzyl derivative represented by the general formula (1):
wherein X
1
represents a halogen atom and R
1
represents an acyl group, with a haloacyl compound represented by the general formula (2):
R
2
—X
2
(2)
wherein X
2
represents a halogen atom and R
2
represents an acyl group, in the presence of Lewis acid. According to this method, a benzylamine derivative as an intermediate, which is useful for the preparation of a carbamate-based agricultural or horticultural bactericide, can be preferably prepared.
direct synthesis of anilides and N-benzylamides under mild conditions (room temperature, ambient pressure) in the absence of metal catalyst and external oxidizing agents using nitriles RCN (R=Me, Et) as amide source is described. This electrochemical approach features moderate to high yields, a broad scope of arenes with different functional groups and is amenable to gram scale synthesis. The key role of