作者:Alice Dias、Nádia Senhorães、L. Conde、M. Proença
DOI:10.1055/s-0030-1259289
日期:2011.1
A series of 2,6,9-substituted adenines were obtained from the easily accessible 5-amino-4-cyanoformimidoyl imidazoles, acetic and benzoic anhydrides, and primary alkyl amines in a three-step sequence. Acylation of 5-amino-4-cyanoformimidoyl imidazoles followed by addition of the amine led to the intermediates 5-amino-4-(N-acyl)formamidino imidazoles under mild conditions. Cyclization of 5-amino-4-(N-acyl)formamidino imidazoles under reflux in ethanol led to the desired substituted adenine. A preliminary stepwise study led to the development of three general and efficient one-pot methods for the synthesis of adenine derivatives. The one-pot, three-step reaction in the presence of DMAP was the most convenient synthetic approach.
一系列2,6,9-取代腺苷是在易于获得的5-氨基-4-氰基甲酰亚胺咪唑、醋酸酐和苯甲酸酐以及初级烷基胺的三步反应中获得的。5-氨基-4-氰基甲酰亚胺咪唑的酰化反应随后添加胺,在温和条件下生成中间体5-氨基-4-(N-酰基)甲酰亚胺咪唑。在乙醇回流条件下对5-氨基-4-(N-酰基)甲酰亚胺咪唑进行环化反应,得到所需的取代腺苷。初步的分步研究促进了三种通用且高效的一锅法合成腺苷衍生物的方法的开发。在DMAP存在下的一锅三步反应是最方便的合成方法。