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
A peroxide-free methodology was developed for the synthesis of benzoylated naphthol/phenol derivatives through oxidative deamination reaction performed under aerobic reaction conditions. A synergistic combination of Cu(OTf)2 and Ag2O was used to convert the aminonaphthols and aminophenols to the corresponding benzoylated derivatives. The definite role of atmospheric oxygen to assist the reaction was
and neat conditions in the presence of Montmorillonite K30 catalyst, which is safe, cheap, and commercially available and does not require any preparations. It is fully recoverable and recyclable for up to 5 runs. Both secondary and primary aliphaticamines give products in good to excellent yields. The developed protocol displays a very high Atom Economy and a low E‐Factor.
Diastereoselective α-C–H functionalization of aliphatic N-heterocycles: an efficient route to ring fused oxazines
作者:Sujit Mahato、Surajit Haldar、Chandan K. Jana
DOI:10.1039/c3cc46191b
日期:——
A novel method for direct CâH functionalization of saturated N-heterocycles allowing easy access to synthetically as well as biologically important and structurally diverse ring-fused oxazines is developed. The method is operationally simple and highly diastereoselective. Moreover, it is efficient in functionalizing broad classes of both cyclic and acyclic amines including the substrates that are otherwise difficult to functionalize.
An efficient, multicomponent synthesis of aminoalkylnaphthols via Betti reaction using ZSM‐5 as a recoverable and reusable catalyst
作者:Rangappa S. Keri、Mahadeo Patil、Srinivasa Budagumpi、Balappa S. Sasidhar
DOI:10.1002/aoc.6316
日期:2021.9
environmentally friendly catalysts to reduce the number of toxic wastes are critical for improving the chemical synthetic protocols. A simple, mild, efficient, and eco-friendly method was developed for the synthesis of a series of Betti bases, 1-(α-aminoalkyl)naphthols, via a one-pot, multi-component reaction from aldehydes, β-naphthol and secondary amines in the presence of H-ZSM-5 as a catalyst at room temperature