of rat brain. Stereochemical assignments for 7c, 7d, 9c, and 9d were deduced from NMR spectral analyses. Conformational analysis revealed that the 2 alpha isomers (7d and 9d) exist in solution as mixtures of cis- and trans-fused conformers with ca. 90 and 45% cis form, respectively. Other compounds (12a, 12b, and 14) related to these propionanilides were also prepared, stereochemically characterized
N-(1,3,4,6,7,11b-六氢-7-苯基-2H-苯并[a]
喹啉嗪-2-基)-N-苯基丙酰胺的非对映异构体(7c,7d,9c和9d合成了
芬太尼的构象受限的类似物),并分别测试了其对大鼠脑的阿片受体的镇痛活性和亲和力。从NMR光谱分析推导出7c,7d,9c和9d的立体
化学分配。构象分析表明,溶液中存在2个α异构体(7d和9d),为顺式和反式构象异构体与ca的混合物。分别为90和45%的顺式形式。还制备了与这些丙酰
苯胺有关的其他化合物(12a,12b和14),并进行了
化学表征和测试。观察到7d的镇痛作用较弱,并且7d和9d均以约50的I50与阿片受体结合。分别为1100和1500 nM(约0。5%的
芬太尼和2%的
吗啡)。阿片拮抗剂
纳洛酮取消了7d的镇痛作用。