A general and stereoselective approach to 14-membered cyclic bis-semicarbazones involving BF<sub>3</sub>-catalyzed amidoalkylation of 2-(trimethylsilyloxy)propene
作者:Anastasia A. Fesenko、Anatoly D. Shutalev
DOI:10.1039/d2ob00644h
日期:——
11-hexaazacyclotetradeca-7,14-diene-3,10-diones, starting from aldehyde semicarbazones has been developed. The key intermediates, 4-(3-oxobut-1-yl)semicarbazones, were prepared by BF3-catalyzed amidoalkylation of 2-(trimethylsilyloxy)propene with 4-[(aryl)(methoxy)methyl]- or 4-[(aryl)(tosyl)methyl]semicarbazones. Treatment of these intermediates with excess of hydrazine gave hydrazones of 4-(3-oxob
14 元环状双氨基脲、5,12-二芳基-7,14-二甲基-1,2,4,8,9,11-六氮杂环十四烷-7,14-二烯-3 的通用立体选择性五步法,10-二酮,从醛缩氨基脲开始开发。关键中间体 4-(3-氧代丁-1-基)氨基脲是由 BF 3催化的 2-(三甲基甲硅烷氧基)丙烯与 4-[(芳基)(甲氧基)甲基]-或 4-[(芳基)(甲苯磺酰基)甲基]缩脲。用过量的肼处理这些中间体得到4-(3-氧代丁-1-基)氨基脲或4-(3-氧代丁-1-基)氨基脲的腙,它们在TsOH存在下转化为目标大环化合物。这种方法的所有步骤都可以轻松扩展到多克级别。