Protective group-free synthesis of new chiral diamines via direct azidation of 1,1-diaryl-2-aminoethanols
作者:Harendra Nath Roy、Arigala Pitchaiah、Miri Kim、In Taek Hwang、Kee-In Lee
DOI:10.1039/c3ra23205k
日期:——
A direct azidation of tertiary alcohols using sodium azide–sulfuric acid is described; the present method provides an efficient and practical path for the synthesis of new chiral diamines from unmasked 1,1-diaryl-2-aminoethanols derived from natural amino acids.
A novel sulfonamide catalyst based on a room temperature ionic liquid (RTIL) has been developed for the enantioselective reduction of ketones in refluxing toluene. The optically active secondary alcohol products were obtained in good enantiomeric excess and excellent yields. The imidazolium-tagged sulfonamide catalyst can be readily recovered and reused four times without any significant loss of catalytic activity. (c) 2006 Elsevier Ltd. All rights reserved.