Synthesis of 3H- and 14C-labelled CP-88,059: A potent atypical antipsychotic agent
作者:Harry R. Howard、Kevin D. Shenk、Teresa A. Smolarek、Michael H. Marx、James H. Windels、Robert W. Roth
DOI:10.1002/jlcr.2580340203
日期:1994.2
The syntheses of 3H- and 14C-labelled CP-88,059 [i.e., 5-(2-(4-(1,2-benzisothiazol-3-yl)piperazinyl)ethyl)-6-chloro-1, 3-dihydro-2H-indol-2-one] are described. CP-88,059 (5b) is a combined D2/5-HT2 antagonist currently undergoing clinical evaluation as an antipsychotic agent with reduced potential for induction of EPS in schizophrenic patients. Displacement of bromine from the 7-position of the benzisothiazole moiety, by reductive dehydrogenation with tritium gas and Pd/BaSO4 catalysis, provided 3H-CP-88,059 (5c). Incorporation of 14C into the ethylene portion of the molecule was achieved via the Friedel-Crafts acylation of 6-chlorooxindole with [2-14C]-chloroacetyl chloride, followed by triethylsilane reduction of the aryl carbonyl and coupling with N-(1,2-benzisothiazol-3-yl)piperazine in refluxing aqueous Na2CO3.
本文介绍了 3H 和 14C 标记的 CP-88,059 [即 5-(2-(4-(1,2-苯并异噻唑-3-基)哌嗪基)乙基)-6-氯-1, 3-二氢-2H-吲哚-2-酮] 的合成。CP-88,059 (5b)是一种 D2/5-HT2 联合拮抗剂,目前正在作为一种抗精神病药物进行临床评估,这种药物诱发精神分裂症患者 EPS 的可能性较低。通过氚气还原脱氢和 Pd/BaSO4 催化,将溴从苯并异噻唑分子的 7 位置换出来,得到了 3H-CP-88,059 (5c)。通过[2-14C]-氯乙酰氯对 6-氯氧化吲哚进行弗里德尔-卡夫酰化,然后用三乙基硅烷还原芳基羰基,并在回流的 Na2CO3 水溶液中与 N-(1,2-苯并异噻唑-3-基)哌嗪偶联,实现了 14C 与分子乙烯部分的结合。