4-(1,2,4-Triazol-1-yl)- and 4-(3-nitro-1,2,4-triazol-1-yl)-1-(β-<scp>D</scp>-2,3,5-tri-O-acetylarabinofuranosyl)pyrimidin-2(1H)-ones. Valuable intermediates in the synthesis of derivatives of 1-(β-<scp>D</scp>-arabinofuranosyl)cytosine (ara-C)
作者:K. J. Divakar、Colin B. Reese
DOI:10.1039/p19820001171
日期:——
Treatment of the acetylated derivative (3b), which was prepared from uridine in 86% overall yield, with tri(1H-1,2,4-triazol-1-yl)phosphine oxide gave compound (6a) in high yield, and with 3-nitro-1,2,4-triazole and diphenyl phosphorochloridate it gave compound (6b) in high yield. When the former product (6a) was allowed to react with ammonia, methylamine, dimethylamine, and morpholine at room temperature
用三(1 H -1,2,4-三唑-1-基)膦氧化物处理尿苷制得的乙酰化衍生物(3b),其总收率为86%,得到高产率的化合物(6a),和用3-硝基-1,2,4-三唑和二苯基氯代磷酸酯以高收率得到化合物(6b)。当在室温下使前一种产物(6a)与氨,甲胺,二甲胺和吗啉反应,并且必要时将产物进一步脱乙酰基时,ara-C(1; R 1 = R 2 = H)及其对应的4 - ñ -烷基衍生物(1; R 1 = H,R 2 = Me)时,(1; R 1 = R 2 = Me)和[1; R 1,R 2 = –(CH2) 2 O(CH 2) 2 –]的产率很高。当化合物(6a)或(6b)与苯胺在吡啶溶液中加热,然后产物脱乙酰化时,以高收率获得4- N-苯基-芳族-C(1; R 1= H,R 2= Ph)。将硝基化合物(6b)转化为ara-C衍生物(1; R 1 = H,R 2 = CH 2 CO 2 Me)