作者:L. A. Popova、N. Ya. Yurashevich、V. A. Knizhnikov
DOI:10.1023/b:rujo.0000034963.96456.70
日期:2004.3
Leucine methyl and ethyl esters reacted with 3-bromobenzaldehyde and 4-chlorobenzaldehyde in anhydrous methanol in the presence of magnesium sulfate to afford the coresponding Schiff bases of the general formula (CH3)(2)CHCH2CH(COOR1)N=CHR2 [R-1 = CH3, C2H5, R-2 = 3-BrC6H4, 4-ClC6H4]. Their reduction with sodium tetrahydridoborate yielded N-benzyl derivatives (CH3)(2)CHCH2CH(COOR1)NHCH2R2, which were converted into N-acyl-N-benzyl derivatives (CH3)(2)CHCH2CH(COOR1)N(COR3)CH2R2 [R-3 = CH3, C6H5].