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。
Copper-Catalyzed Regioselective Intramolecular Oxidative α-Functionalization of Tertiary Amines: An Efficient Synthesis of Dihydro-1,3-Oxazines
作者:Mohit L. Deb、Suvendu S. Dey、Isabel Bento、M. Teresa Barros、Christopher D. Maycock
DOI:10.1002/anie.201304654
日期:2013.9.9
Traffic control: The hydroxy functional group directs the α‐functionalization of tertiary amines, synthesizing 1,3‐oxazines by CO bond formation. Reaction occurs with both benzylic and non‐benzylic amines. In the case of naphthoxazine synthesis, 100 % diastereoselectivity was observed. A tentative two‐pathway mechanism is proposed for the reaction.
Metal-free intramolecular α-sp3 C–H oxygenation of tert-amine: An efficient approach to 1,3-oxazines
作者:Mohit L. Deb、Choitanya Dev Pegu、Paran J. Borpatra、Pranjal K. Baruah
DOI:10.1016/j.tetlet.2016.10.086
日期:2016.12
iodine-tert-butylhydroperoxide promoted intramolecular sp3 C–H oxygenation α- to tertiary amine for the synthesis of 1,3-oxazines. The reaction is metal-free, atom economic, high yielding and proceeds within a short time under heating at 130 °C in DMF solvent. A variety of Betti bases of naphthol and phenol having cyclic as well as acyclic tert-amine moieties are employed as the starting materials. The Betti
在这里,我们公开了碘-叔丁基过氧化氢促进分子内sp 3 C–H氧化α-生成叔胺,用于合成1,3-恶嗪。该反应是无金属的,原子经济的,高产率的,并且在DMF溶剂中在130℃加热下在短时间内进行。各种萘酚的贝提碱和具有环状苯酚以及非环状叔-胺部分被用作起始原料。萘酚的Betti碱可产生单一的恶嗪非对映异构体,而酚Betti碱可提供非对映体混合物。机理研究表明,涉及“ I + ”作为活性催化物质的非自由基途径。该方法在数克规模的反应上具有优异的产率。