Potential cerebral perfusion agents: synthesis and evaluation of a radioiodinated vinylalkylbarbituric acid analog
作者:Prem C. Srivastava、Alvin P. Callahan、Evelyn B. Cunningham、Furn F. Knapp
DOI:10.1021/jm00359a020
日期:1983.5
5-chloropentyne and propargyl bromide with diethyl 2-ethyl-2-sodiomalonate (DESM) provided diethyl 2-ethyl-2-(1-pentyn-5-yl)malonate (3) and diethyl 2-ethyl-2-propargylmalonate (4), respectively. Similar condensation of DESM with (E)-(5-iodo-1-penten-1-yl)boronic acid (9) or the reaction of catecholborane with 3 provided diethyl (E)-2-ethyl-2-(1-borono-1-penten-5-yl)malonate (8). The direct sodium iodide-chloramine-T
已经制备了新的碘化巴比妥酸盐。用2-乙基-2-磺基丙二酸二乙酯(DESM)处理5-氯戊炔和炔丙基溴,得到2-乙基-2-(1-戊炔基-戊基)丙二酸二乙酯(3)和2-乙基-2-炔丙基丙二酸二乙酯(4)分别。DESM与(E)-(5-碘-1-戊-1-基)硼酸(9)的类似缩合反应或儿茶酚硼烷与3的反应制得二乙基(E)-2-乙基-2-(1-硼醇) -1-戊烯-5-基)丙二酸酯(8)。直接将碘化钠-氯胺-T碘化为8或用DESM处理(E)-1,5-二碘-1-戊烯(10)提供二乙基(E)-2-乙基-2-(1-碘- 1-戊烯基(5-戊基)丙二酸酯(11)。在碱的存在下,官能化的丙二酸酯3、4和11与尿素的缩合提供了相应的巴比妥酸酯,即5-乙基-5-(1-戊炔-5-基)-(5),5-乙基-5-炔丙基-(6),和(E)-5-乙基-5-(1-碘-1-戊烯-5-基)巴比妥酸(12)。分离作为(11)的水解副产物的(E