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
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.
Copper catalyzed oxidative deamination of Betti bases: an efficient approach for benzoylation/formylation of naphthols and phenols
作者:Mohit L. Deb、Choitanya Dev Pegu、Paran J. Borpatra、Pranjal K. Baruah
DOI:10.1039/c6ra04567g
日期:——
A copper-catalyzed benzoylation/formylation of naphthols and phenols via oxidativedeamination of Betti bases.
通过Betti碱的氧化脱氨作用,铜催化的萘酚和苯酚的苯甲酰化/甲酰化。
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.
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.