C-C bond cleavage: Metal-free-catalyzed reaction of Betti bases with various heterocycles under microwave irradiation
作者:Mohit L. Deb、B.-Shriya Saikia、Kongkona Borah、Pranjal K. Baruah
DOI:10.1080/00397911.2016.1239740
日期:2016.12.1
ABSTRACT The reaction of Betti bases with various heterocycles in the presence of p-toluenesulphonic acid (PTSA) under microwave irradiation gives bis(heterocycle)methanes through benzyl transfer. The reaction proceeds via the cleavage of C-N bond followed by C-C bond. The metal-free cleavage of C-C bond, which is in fact a C-dearylation, is rarely reported in the literature. GRAPHICAL ABSTRACT
Divergent reaction: metal & oxidant free direct C–H aryloxylation and hydride free formal reductive N-benzylation of N-heterocycles
作者:Sujit Mahato、Md Ashraful Haque、Soumita Dwari、Chandan K. Jana
DOI:10.1039/c4ra05045b
日期:——
Metal, oxidant and other additive-free novel methods for direct C–H aryloxylation of aliphatic amines are developed. In the presence of excess amine, the course of the reaction was diverted, producing various arylmethylamines via hydride-free formal reductive amination. Involvement of a quinonemethideintermediate was revealed from mechanistic studies.
Metal-free new synthesis of 1,3-naphthoxazines via intramolecular cross dehydrogenative-coupling reaction of 1-(α-aminoalkyl)-2-naphthols using hypervalent iodine(III) reagent
作者:Nitin A. Waghmode、Amit H. Kalbandhe、Prerana B. Thorat、Nandkishor N. Karade
DOI:10.1016/j.tetlet.2015.12.117
日期:2016.2
A series of 1-(α-aminoalkyl)-2-naphthols were synthesized via three-component Betti reaction of β-naphthol, aldehyde, and cyclic secondary amine under reflux conditions. The subsequent reactions of 1-(α-aminoalkyl)-2-naphthols with (diacetoxyiodo)benzene resulted in the formation of 1,3-napthoxazines. This reaction demonstrates the formation of CO bond via cross dehydrogenative-coupling (CDC) under
reaction of a variety of 1-(aminoalkyl)-2-naphthols or 2-(aminoalkyl)phenols to give the corresponding 1,3-oxazines was developed. The reaction is simple, atom-economic, and proceeds smoothly at roomtemperature under metal-free conditions in ethanol as solvent.
microdroplet method was developed for the synthesis of fifteen Betti bases using a variety of aldehydes, naphthols and amines with a 6.53×103 acceleration factor and 68–98 % yields at a scaled-up amount of 1.9 g h−1, making it an attractive sustainable alternative to classic organic synthesis for constructing Betti bases and derivatives.
开发了一种温和、无催化剂、高效且环保的微滴方法,用于使用各种醛类、萘酚类和胺类合成 15 种 Betti 碱基,加速因子为 6.53×10 3,放大后产率为 68–98%量为 1.9 g h -1,使其成为构建 Betti 碱和衍生物的经典有机合成的有吸引力的可持续替代品。