An efficient oxidative coupling protocol for amide formation has been developed. Various tertiary amines and aromatic aldehydes were oxidized to their corresponding tertiary amides in moderate to good yields in the presence of a simple nBu4NI-catalyst.
已经开发了用于酰胺形成的有效的氧化偶联方案。在简单的n Bu 4 NI催化剂存在下,各种叔胺和芳族醛以中等到良好的收率被氧化成它们相应的叔酰胺。
KMnO4-mediated oxidative C N bond cleavage of tertiary amines: Synthesis of amides and sulfonamides
作者:Zhang Zhang、Yong-Hong Liu、Xi Zhang、Xi-Cun Wang
DOI:10.1016/j.tet.2019.03.047
日期:2019.5
KMnO4-mediated oxidative CN bond cleavage of tertiaryamines producing secondary amine was introduced, which was trapped by electrophiles (acyl chloride and sulfonyl chloride) to form amides and sulfonamides. The reaction could take place at mild condition, tolerating a wide range of function groups and affording products in moderate to excellent yields.
Manganese-Mediated Reductive Transamidation of Tertiary Amides with Nitroarenes
作者:Chi Wai Cheung、Jun-An Ma、Xile Hu
DOI:10.1021/jacs.8b03739
日期:2018.6.6
an important class of organic compounds, which have widespread industrial applications. Transamidation of amides is a convenient method to generate new amides from existing ones. Tertiary amides, however, are challenging substrates for transamidation. Here we describe an unconventional approach to the transamidation of tertiary amides using nitroarenes as the nitrogen source under reductive conditions
abundant alkyl esters to afford amide bonds with exquisite selectivity by acyl C-O bond cleavage. The utility of this process is showcased by a broad scope of the method, including various sensitive functional groups, late-stage modification and the synthesis of drug molecules (>80 examples). Remarkable selectivity towards different functional groups and within different amide and ester electrophiles
酰胺键是化学和生物学中最基本的官能团之一,在许多简化关键药物和工业分子合成的过程中发挥着核心作用。尽管酰胺的合成是学术和工业科学家最常进行的反应之一,但由于该过程不利的动力学和热力学贡献,叔酰胺的直接转酰胺具有挑战性。在此,我们报告了第一种通用的、温和的和高度化学选择性的方法,用于通过非亲核胺的直接酰基 NC 键裂解对未活化的叔酰胺进行转酰胺。这种操作简单的方法是在没有过渡金属的情况下进行的,并且在异常温和的反应条件下进行。在这种情况下,我们进一步描述了大量烷基酯的直接酰胺化,以通过酰基 CO 键裂解提供具有极好的选择性的酰胺键。该方法的广泛应用展示了该过程的实用性,包括各种敏感的官能团、后期修饰和药物分子的合成(> 80 个例子)。观察到对不同官能团以及不同酰胺和酯亲电试剂的显着选择性,这是使用现有方法不可行的。进行了广泛的实验和计算研究,以深入了解高选择性的机制和起源。我们进一步提出了
Iron-Catalyzed Oxidative Decarbonylative α-Alkylation of Acyl-Substituted Furans with Aliphatic Aldehydes as the Alkylating Agents
作者:Wenkun Luo、Yongjie Yang、Bo Liu、Biaolin Yin
DOI:10.1021/acs.joc.0c01002
日期:2020.7.17
protocol for FeCl2-catalyzed oxidative decarbonylative α-alkylation of acyl furans using alkyl aldehydes as the alkylating agents has been developed. This protocol affords α-alkyl-α-acylfurans in moderate to good yields in a practical and sustainable fashion. Mechanistic studies suggest that the reaction proceeds via generation of an alkyl radical from the alkyl aldehyde, addition of the radical to