A simple catalyst of Ni(OAc)2 and P(t-Bu)3 enables selective C-alkylation of thioacetamides and primary acetamide with alcohols for the first time. Monoalkylation of thioamides, amides and t-butyl esters occurs in excellent yields (>95%). Mechanistic studies reveal that the reaction proceeds via a hydrogen autotransfer pathway.
oxidative C(sp3 )-H amidation for the synthesis of β -lactams using t BuOO t Bu. This method is based on Kharasch-Sosnovsky amidation and does not require prefunctionalization of C(sp3 )-Hbonds or the installation of a directing group, thereby allowing for the straightforward synthesis of β -lactams. Our intramolecular functionalization protocol can be extended to diverse benzylicC(sp3 )-Hbonds and
β-内酰胺由于在天然产物和药物中普遍存在而成为重要的结构基序。我们在此报告了使用t BuOO t Bu合成β-内酰胺的Cu催化的分子内氧化C(sp 3)-H酰胺化反应。该方法基于Kharasch-Sosnovsky酰胺化,不需要C(sp 3)-H键的预功能化或定向基团的安装,从而可以直接合成β-内酰胺。我们的分子内功能化协议可以扩展到各种苄基C(sp 3)-H键,并显示出色的官能团耐受性。
A new radical-mediated intramolecular arene C(sp2)-H amidation of 3-phenylpropanamides or [1,1'-biphenyl]-2-carboxamides was developed to prepare a series of 3,4-dihydro-2(1H)-quinolinone and phenanthridone derivatives in moderate to excellent yields (33-94%). Spirolactams could also be obtained using this protocol.
Organic ligand-free carbonylation reactions with unsupported bulk Pd as catalyst
作者:Shujuan Liu、Hongli Wang、Xingchao Dai、Feng Shi
DOI:10.1039/c8gc00740c
日期:——
ligand-free conditions, namely, hydroaminocarbonylation of olefins, aminocarbonylation of aryliodides and oxidative carbonylation of amines, which almost cover all the known mechanisms in carbonylation reactions. Notably, the bulk Pdcatalyst system exhibited better catalytic activity than the classical homogeneous PdCl2/(2-OMePh)3P catalyst system. This study will create a momentous and new field of green
A new lipase, Ndbn, capable of efficiently catalyzing the amidation between esters and aromatic amines which are weak nucleophilic reagents was discovered. Furthermore, Ndbn exhibits the capability to catalyze the aminolysis of carboxylic acids without the need for preparing ester substrate or a strictly anhydrous reaction environment. Additionally, an unusual preference of Ndbn for aromatic amines