Synthesis and NMR characteristics of <i>N</i>
-acetyl-4-nitro, <i>N</i>
-acetyl-5-nitro, <i>N</i>
-acetyl-6-nitro and <i>N</i>
-acetyl-7-nitrotryptophan methyl esters
作者:Russell R. King、Larry A. Calhoun
DOI:10.1002/mrc.2377
日期:2009.3
N‐acetyl‐4‐nitrotryptophan methyl ester (2), N‐acetyl‐5‐nitrotryptophan methyl ester (3), N‐acetyl‐6‐nitrotryptophan methyl ester (4) and N‐acetyl‐7‐nitrotryptophan methyl ester (5) were synthesized through a modified malonicesterreaction of the appropriate nitrogramine analogs followed by methylation with BF3‐methanol. Assignments of the 1H and 13C NMR chemical shifts were made using a combination