Design and Synthesis of Isoxazole Containing Bioisosteres of Epibatidine as Potent Nicotinic Acetylcholine Receptor Agonists.
摘要:
描述了一种高效合成含有异氧杂环的依比加丁等体的合成方法。合成从N-叔丁氧羧基(Boc)-exo-2-(甲氧羧基)-7-氮杂双环[2.2.1]庚烷(9)开始。化合物9与适当取代的肟类的锂二盐在四氢呋喃(THF)中反应。所得到的β-酮肟的环脱水反应和在5N盐酸水溶液中去保护N-Boc基团,得到了含有依比加丁等体的异氧杂环(6-8)。这些化合物在尼古丁乙酰胆碱受体上的结合亲和力通过[3H]细胞素的取代测定。与3'-甲基异氧杂环等体(7)相比,不带取代基的异氧杂环等体(6)显示出更低的结合活性。在异氧杂环的3'-位置用苯基取代显著降低了结合活性。这些类似物的体内毒理研究也进行了。类似物的LD50范围为:Me > H > Ph。
Design and Synthesis of Isoxazole Containing Bioisosteres of Epibatidine as Potent Nicotinic Acetylcholine Receptor Agonists.
摘要:
描述了一种高效合成含有异氧杂环的依比加丁等体的合成方法。合成从N-叔丁氧羧基(Boc)-exo-2-(甲氧羧基)-7-氮杂双环[2.2.1]庚烷(9)开始。化合物9与适当取代的肟类的锂二盐在四氢呋喃(THF)中反应。所得到的β-酮肟的环脱水反应和在5N盐酸水溶液中去保护N-Boc基团,得到了含有依比加丁等体的异氧杂环(6-8)。这些化合物在尼古丁乙酰胆碱受体上的结合亲和力通过[3H]细胞素的取代测定。与3'-甲基异氧杂环等体(7)相比,不带取代基的异氧杂环等体(6)显示出更低的结合活性。在异氧杂环的3'-位置用苯基取代显著降低了结合活性。这些类似物的体内毒理研究也进行了。类似物的LD50范围为:Me > H > Ph。
Design and Synthesis of Isoxazole Containing Bioisosteres of Epibatidine as Potent Nicotinic Acetylcholine Receptor Agonists.
作者:Satendra SINGH、Kwasi S. AVOR、Buddy POUW、Thomas W. SEALE、Garo P. BASMADJIAN
DOI:10.1248/cpb.47.1501
日期:——
An efficient synthesis of isoxazole containing isosteres of epibatidine is described. The synthesis proceeded from N-tert-butoxycarbonyl (Boc)-exo-2-(methoxycarbonyl)-7-azabicyclo[2.2.1]heptane (9). Compound 9 was reacted with the dilithium salt of an appropriately substituted oxime in tetrahydrofuran (THF). Cyclodehydration of the resultant β-keto oxime and deprotection of the N-Boc group in 5N aqueous HCl afforded the isoxazole containing isosteres of epibatidine (6-8). The binding affinities of these compounds were determined at the nicotinic acetylcholine receptor for the displacement of [3H]cytisine. The unsubstituted isoxazole containing isostere (6) showed the lower binding potency compared to the 3'-methylisoxazole isostere (7). Substitution with a phenyl group at the 3'-position of the isoxazole significantly reduced the binding potency. The in vivo toxicological studies of these analogs were also performed. The LD50 of the analogs ranged in the order : Me>H>Ph.
描述了一种高效合成含有异氧杂环的依比加丁等体的合成方法。合成从N-叔丁氧羧基(Boc)-exo-2-(甲氧羧基)-7-氮杂双环[2.2.1]庚烷(9)开始。化合物9与适当取代的肟类的锂二盐在四氢呋喃(THF)中反应。所得到的β-酮肟的环脱水反应和在5N盐酸水溶液中去保护N-Boc基团,得到了含有依比加丁等体的异氧杂环(6-8)。这些化合物在尼古丁乙酰胆碱受体上的结合亲和力通过[3H]细胞素的取代测定。与3'-甲基异氧杂环等体(7)相比,不带取代基的异氧杂环等体(6)显示出更低的结合活性。在异氧杂环的3'-位置用苯基取代显著降低了结合活性。这些类似物的体内毒理研究也进行了。类似物的LD50范围为:Me > H > Ph。