Facile synthesis of 7–10 membered rings by intramolecular condensation using dialkylcarbonate as solvent
作者:Tomomi Ikemoto、Tatsuya Ito、Atsuko Nishiguchi、Kiminori Tomimatsu
DOI:10.1016/j.tetlet.2004.10.120
日期:2004.12
The anilination of o-halogenobenzaldehyde 9 with alkylamino-acid 16 gave o-formylaniline-acid 17. Compound 17 was esterified followed by the improved reaction using the combination of alcoholate and dialkyl carbonate in one-pot, to easily produce 19. Namely, these new processes afforded the desired product 19 in only two steps from the starting materials, as compared with the previous 10 steps. Moreover
建立了一种便捷的大规模合成1-苯并ze庚因19的方法,作为CCR5拮抗剂的重要中间体,口服HIV-1治疗。的anilination ö -halogenobenzaldehyde 9与烷基氨基酸16得到ö -formylaniline酸17。将化合物17酯化,然后在一个锅中使用醇盐和碳酸二烷基酯的组合进行改进的反应,以轻松制得19。即,这些新工艺提供了所需的产品19与之前的10个步骤相比,从起始材料仅需两个步骤。此外,这些便利的方法学已应用于其他杂环,得到8-10元环,例如1-苯甲唑啉,1-苯甲zon嗪和1-苯并ze嗪。