{[[K.18-Crown-6]Br3}n: A tribromide catalyst for the catalytic protection of amines and alcohols
作者:Gholamabbas Chehardoli、Mohammad Ali Zolfigol、Fateme Derakhshanpanah
DOI:10.1016/s1872-2067(12)60644-5
日期:2013.9
[K.18-Crown-6]Br3}n, a unique tribromide-type catalyst, was utilized for the N-boc protection of amines and trimethylsilylation (TMS) and tetrahydropyranylation (THP) of alcohols. The method is general for the preparation of N-boc derivatives of aliphatic (acyclic and cyclic) and aromatic, and primary and secondary amines and also various TMS-ethers and THP-ethers. The simple separation of the catalyst
Preparation, characterization and application of succinimidinium hydrogensulfate ([H-Suc]HSO<sub>4</sub>) as an efficient ionic liquid catalyst for the N-Boc protection of amines
Succinimidinium hydrogensulfate ([H-Suc]HSO4), which is prepared from the reaction of succinimide and sulfuric acid, showed excellent catalytic activity for theN-Boc protection of various amines under solvent free conditions.
Synthesis and Crystal Structure Determination of [H2-cryptand 222](Br3)2: A Unique Tribromide Catalyst for the Catalytic Chemoselective N-Boc Protection of Amines
作者:Gholamabbas Chehardoli、Mohammad Ali Zolfigol、Vahid Khakyzadeh、Reza Golbedaghi、Nikita A. Hall、Allan G. Blackman
DOI:10.1002/jccs.201190018
日期:2011.8
characterized by X‐ray crystallography, and was utilized as an active catalyst for the N‐boc protection of amines. The method is general for the preparation of N‐boc derivatives of aliphatic (acyclic and cyclic), aromatic, primary and secondary amines. We also applied our newreaction protocols for the N‐boc protection of somenew amines and spectral and physical data for the obtained products are reported.
Nano-ferrous ferric oxide (nano-Fe3O4): Powerful, reusable, and stable catalyst for N-Boc protection of amines
作者:Mohammad Ali Zolfigol、Ahmad Reza Moosavi-Zare、Parvin Moosavi、Vahid Khakyzadeh、Abdolkarim Zare
DOI:10.1016/j.crci.2013.05.010
日期:2013.11
Résumé Nano-ferrous ferric oxide (nano-Fe3O4) efficiently catalyzed N-boc protection of amines in high yields and acceptable reaction times. Nano-Fe3O4 was applied as an efficient, green, heterogeneous and reusable magnetite catalyst. Clean reaction, simple purification, short reaction time and high yield were some other advantages of this compound.
N-sulfonic acid poly(4-vinylpyridinium) chloride is easily prepared by the reaction of poly(4-vinylpyridine) with neat chlorosulfonic acid. This reagent can be used as an efficient catalyst for the N-Boc protection of amines at room temperature and neat conditions. This new method consistently has the advantages of excellent yields and short reaction times. Further, the catalyst can be reused and recovered for several times.