Boron-Catalyzed <i>N</i>-Alkylation of Arylamines and Arylamides with Benzylic Alcohols
作者:Murali Mohan Guru、Pradip Ramdas Thorve、Biplab Maji
DOI:10.1021/acs.joc.9b02816
日期:2020.1.17
A sustainable boron-based catalytic approach for chemoselective N-alkylation of primary and secondary aromatic amines and amides with primary, secondary, and tertiary benzylic alcohols has been presented. The metal-free protocol operates at low catalyst loading, tolerates several functional groups, and generates H2O as the sole byproduct. Preliminary mechanistic studies were performed to demonstrate
Reactions of iminotropone derivatives with naphtho[b]cyclopropene under the presence of a catalytic amount of AgBF 4 afforded cyclic amine derivatives via [2 π + 2 σ] type cycloaddition reactions. On the other hand, a reaction using a tropone hydrazone derivative without a catalysis formed a substituted hydrazone via a σ -bond rupture of the cyclopropene ring.
1,4-Butanediol as a Reducing Agent in Transfer Hydrogenation Reactions
作者:Hannah C. Maytum、Javier Francos、David J. Whatrup、Jonathan M. J. Williams
DOI:10.1002/asia.200900527
日期:2010.3.1
H2 in hydrogen‐transfer reactions to ketones, imines, and alkenes. Unlike simple alcohols, which establish equilibrium in the reduction of ketones, 1,4‐butanediol acts essentially irreversibly owing to the formation of butyrolactone, which acts as a thermodynamic sink. It is therefore not necessary to use 1,4‐butanediol in great excess in order to achieve reduction reactions. In addition, allylic alcohols
Gallium(III) Triflate Catalyzed Direct Reductive Amination of Aldehydes
作者:G. K. Surya Prakash、Clement Do、Thomas Mathew、George A. Olah
DOI:10.1007/s10562-010-0347-7
日期:2010.7
Direct hydroamination of aldehydes and ketones provides one-step entry into desired alpha-aminoalkane derivatives which are important synthons for many biologically active molecules. The reductive amination of aldehydes in the presence of silanes has been effectively promoted by Ga(OTf)(3) as a catalyst. Mild conditions, easy work-up and high purity of products with excellent yields are the major advantages of this method.