An efficient and stereoselective approach to 14-membered hexaaza macrocycles using novel semicarbazone-based amidoalkylation reagents
作者:Anastasia A. Fesenko、Alexander N. Yankov、Anatoly D. Shutalev
DOI:10.1016/j.tetlet.2016.11.041
日期:2016.12
An efficient synthesis of hydrazones of 4-(3-oxobutyl)semicarbazides and 4-(3-oxobutyl)semicarbazones using novel semicarbazone-based amidoalkylation reagents, 1-arylidene-4-[(aryl)(tosyl)methyl]semicarbazides, has been developed. The synthesis involved reaction of the latter with the Na-enolate of acetylacetone, followed by a base-promoted retro-Claisen reaction and treatment of the obtained 4-(3
使用新型基于半脲基的酰胺烷基化试剂1-亚芳基-4-[(芳基)(甲苯磺酰基)甲基]半咔唑,可以有效合成4-(3-氧丁基)-氨基脲和4-(3-氧丁基)-氨基脲的。发达。合成包括后者与乙酰丙酮的钠-烯酸酯反应,然后进行碱促进的逆克莱森反应,并用肼或甲基肼处理所得的4-(3-氧代丁基)半咔唑酮。将制备的在酸性条件下立体选择性地转化为14元环状双-半咔唑酮。极高的选择性(反式/顺式 4-(3-氧代丁基)半碳carba的环化反应后观察到(⩾97:3)。讨论了可能的反应途径和该环化的立体化学。