Synthesis of some new thieno[3,4-<i>d</i>]pyrimidines and their<i>C</i>-nucleosides
作者:Shirish A. Patil、Brian A. Otter、Robert S. Klein
DOI:10.1002/jhet.5570300240
日期:1993.3
The synthesis of several new thieno[3,4-d]pyrimidine C-nucleosides 5-8 is described. The known 5-ribosyl-ated methyl 4-(formylamino)thiophene-3-carboxylate key intermediate 20 was obtained as a mixture of anomers in significantly improved yield by condensation of the sugar 15 with methyl 4-(formylamino)thio-phene-3-carboxylate 19 in nitromethane at 60° in the presence of stannic chloride. Attempts
描述了几种新的噻吩并[3,4- d ]嘧啶C-核苷5-8的合成。通过将糖15与甲基4-(甲酰基氨基)噻吩-3缩合,可以以显着提高的收率获得作为已知的5-核糖基化的4-(甲酰胺基氨基)噻吩-3-羧酸甲酯关键中间体20的混合物。在氯化锡存在下,在60°C的硝基甲烷中将羧酸19羧酸酯化。尝试以制备C-7核糖基化化合物21由双环基的直接缩合β 10与15给出而不是N-1核糖基化的核苷16。描述了相应的和以前未知的噻吩并[3,4- d ]嘧啶碱12和13的合成,以及对4-甲硫基衍生物12的稳定性研究。初步的生物学研究表明,腺苷类似物7是几种哺乳动物肿瘤细胞系的有效生长抑制剂。