A concise, highly convergent, and practical synthesis of the clinical-phase anticancer agent batracylin in a two-stage process in excellent yield is described. The B and C rings of this tetracyclic heterocycle are constructed by cascade cyclization of 5-nitro-2-aminobenzyl alcohol with 2-cyanomethyl benzoate in trifluoroacetic acid in good yield in a single-pot reaction. A plausible mechanism for the cascade reaction is also proposed. As part of these studies, a range of batracylin derivatives with different substituents on the C and D rings are synthesized.
描述了一种简洁、高度收敛且实用的临床阶段抗癌剂巴曲林的两步合成方法,该方法具有优异的产率。该四环杂环的B环和C环通过在
三氟乙酸中将5-硝基-2-
氨基
苯甲醇与2-
氰基甲基
苯甲酸酯进行级联环化反应合成,产率良好,且为单锅反应。还提出了级联反应的合理机制。在这些研究中,还合成了一系列在C环和D环上具有不同取代基的巴曲林衍
生物。