作者:J. J. Cappon、K. D. Witters、J. Baart、P. J. E. Verdegem、A. C. Hoek、R. J. H. Luiten、J. Raap、J. Lugtenburg
DOI:10.1002/recl.19941130603
日期:——
coupling with the bislactim ether of cyclo-D-valylglycine. Deprotection of the coupling product afforded L-histidine in high optical purity. Syntheses for the isotopically labelled synthons were developed starting from simple, commercially available, highly enriched compounds. The labelled L-histidines were characterized by mass spectrometry and 1H-, 13C- and 15N-NMR spectroscopy.
(2'- 13 C)-,(1'- 15 N)-和(3'- 15 N)-L-组氨酸是根据允许13 C或15对所有碳和氮位置或位置的任何组合进行N标记。通过将甲苯磺酰基甲基异氰化物与3-苯基丙烯醛缩合并随后环加苄胺来构建1,5-二取代的咪唑环。将咪唑中间体转化为1-苄基-5-(氯甲基)-咪唑鎓氯化物,其通过与环D-戊基甘氨酸的双内酯醚的对映选择性偶联而与甘氨酸部分偶联。偶联产物的脱保护得到高光学纯度的L-组氨酸。同位素标记的合成子的合成是从简单的,可商购的,高度富集的化合物开始的。通过质谱和1 H-,13 C-和15表征标记的L-组氨酸N-NMR光谱。