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。