Synthesis of (S)-5,6-dibromo-tryptophan derivatives as building blocks for peptide chemistry
作者:Adriano Mollica、Azzurra Stefanucci、Federica Feliciani、Gino Lucente、Francesco Pinnen
DOI:10.1016/j.tetlet.2011.03.041
日期:2011.5
5,6-Dibromo-tryptophan is an interesting amino acid whose derivatives and analogues are found in a variety of highly bioactive natural compounds. Notwithstanding its relevance no data concerning this compound are found in the literature. Here an efficient pathway for the synthesis of 5,6-dibromo-tryptophan derivatives is reported. The reaction is performed by using 6-Br-isatin as starting material
5,6-二溴色氨酸是一种有趣的氨基酸,其衍生物和类似物存在于多种高度生物活性的天然化合物中。尽管其相关性,但在文献中未发现有关该化合物的数据。这里报道了合成5,6-二溴-色氨酸衍生物的有效途径。通过使用6-Br-isatin作为起始原料进行反应。在位置5进行选择性溴化之后,进行中间体α-酮酰胺的BH 3还原,并在Ac 2 O / AcOH中用Ser-OH进行烷基化。通过获得的外消旋混合物的酶促脱乙酰作用实现光学拆分。最后,在原位Ñ α旋光纯的-Boc保护小号形式得到所需Ñ α -Boc-(小号)-5,6-二溴-色氨酸。