Synthesis of 1-.BETA.-D-(5-Deoxy-5-iodoarabinofuranosyl)-2-nitroimidazole (.BETA.-IAZA): A Novel Marker of Tissue Hypoxia.
作者:Piyush Kumar、Kazue Ohkura、Davood Beiki、Leonard Irving Wiebe、Koh-ichi Seki
DOI:10.1248/cpb.51.399
日期:——
The present work describes the synthesis of the β-isomer of 1-α-D-(5-deoxy-5-iodoarabinofuranosyl)-2-nitroimidazole (IAZA). Radioiodinated IAZA (123I-IAZA) has been extensively studied as a radiopharmaceutical for the diagnosis of regional and/or focal tissue hypoxia in a variety of clinical pathologies. The β-anomer of IAZA, 1-β-D-(5-deoxy-5-iodoarabinofuranosyl)-2-nitroimidazole (β-IAZA, 1), was synthesized via an unconventional route starting from 1-β-D-(ribofuranosyl)-2-nitroimidazole (AZR), with a change of configuration at the C-2′-position to afford 1-β-D-(arabinofuranosyl)-2-nitroimidazole (β-AZA, 7). Nucleophilic iodination of the 5′-O-toluenesulfonyl-2′,3′-di-O-acetyl precursor of β-AZA, 9, followed by deprotection, afforded 1 in satisfactory yield. β-IAZA (1) was also synthesized from 7 using molecular iodine and triphenylphosphine.
本研究描述了1-α-<小>D小>-(5-脱氧-5-碘阿拉伯呋喃糖基)-2-硝基咪唑(IAZA)β-异构体的合成。放射性碘化IAZA(123I-IAZA)作为一种放射性药物,已被广泛用于诊断各种临床病理中的区域和/或局灶性组织缺氧。IAZA的β异构体--1-β-<小>D小>-(5-脱氧-5-碘阿拉伯呋喃糖基)-2-硝基咪唑(β-IAZA,1)是由1-β-<小>D小>-(核糖呋喃糖基)-2-硝基咪唑(AZR)通过非常规路线合成的、通过改变 C-2′ 位的构型,得到 1-β-<小>D小>-(阿拉伯呋喃糖基)-2-硝基咪唑(β-AZA,7)。对 β-AZA 的 5′-O-甲苯磺酰基-2′,3′-二-O-乙酰基前体 9 进行亲核碘化,然后进行脱保护,得到了 1,产率令人满意。还利用分子碘和三苯基膦从 7 合成了 β-IAZA (1)。