5-fluorouracil derivatives. 1. Acyclonucleosides through a tin (IV) chloride-mediated regiospecific ring opening of alkoxy-1,4-diheteroepanes
作者:J. Campos、M.J. Pineda、J.A. Gómez、A. Entrena、M.A. Trujillo、M.A. Gallo、A. Espinosa
DOI:10.1016/0040-4020(96)00439-5
日期:1996.6
and the use of tin (IV) chloride, capable of a 1,4-chelation, seem to impose their influence in the regiospecific ring opening of 1a-g. The conformational analyses carried out on 2b and (1R,3R)-2e and (1R,3S)-2e clearly indicate that the N1(sp2)-C1-C2-C3 moiety tends to fold in a gauche conformation. The antitumour activities of compounds 2b-g were assessed against HEp human cells showing that 2c is 4-fold
5-氟尿嘧啶在室温下在氯化锡(IV),三甲基氯硅烷和六甲基二硅氮烷的存在下与七元缩醛1a-g反应,得到1-[[3-(2-(羟乙基杂)-1-烷氧基]烷基] -5-氟尿嘧啶2A-F和1 - [2-(3-羟基丙氧基)-1-异丙氧基]乙基} -5-氟尿嘧啶2克在31-86%的产率。杂原子在环缩醛的1位上的存在和氯化锡(IV)能够进行1,4-螯合,似乎在1a-g的区域特异性开环中施加了它们的影响。对2b和(1 R,3 R)-2e和(1 R,3S)-2e清楚地表明,N 1(sp 2)-C 1 -C 2 -C 3部分倾向于以薄纱构象折叠。评估化合物2b-g对HEp人类细胞的抗肿瘤活性,显示2c的活性是5-FU的4倍。与5-FU的毒性作用相比,所研究的药物未显示任何明显的毒性。