A diastereoselective intramolecular Pictet–Spengler condensation was developed to achieve an SP3-rich 6-5-6-6 ketopiperazine-type scaffold. The cyclisation employs tryptophan-based dipeptide precursors which allow product stereochemistry to be tailored using readily available d and l amino acids. SAR analysis, examining different scaffold substitutions and stereochemical configurations, led to the
开发了非对映选择性分子内Pictet-
SPengler 缩合以实现富含
SP 3的6-5-6-6 酮
哌嗪型支架。环化使用基于色
氨酸的二肽前体,允许使用容易获得的d和l
氨基酸定制产品立体
化学。
SAR 分析,检查不同的支架替代物和立体
化学构型,导致发现了对布氏锥虫、克氏锥虫和主要利什曼原虫具有活性的先导化合物。