5-甲基-5-对氟苯甲酰丙基巴比吐酸及5-乙基-5-对氟苯甲酰丙基巴比吐酸的晶体及分子结构

前言为了寻找适合于外科手术的镇静剂,六十年代初人们开始对丁酰对氟苯类衍生物进行大量筛选,得到较符合临床镇静要求的氟哌啶。它是一种强效安定剂。经过多年临床使用也发现它的一些不良的副作用。人们试图寻找更好的化合物以改善氟呱啶不足之处。金声等首先合成一些5-烷基-5-对氟苯甲酰丙基巴比吐酸及硫代巴比吐酸。其中5-乙基-5-对氟苯甲酰丙基巴比吐酸(X=O,R=Et):有明显的镇静作用,动物实验效果与氟哌啶近似,优于鲁米那,

THE MOLECULAR AND CRYSTAL STRUCTURES OF 5-METHYL-5-P-FLUOROBENZOYLPROPYLBARBITURIC ACID AND 5-ETHYL-5-P-FLUOROBENZOYLPROPYL-BARBITURIC ACID

The three dimensional X-ray data were collected by Nicolet R3 four circle diffractometer. Compound(Ⅰ)crystallized in monoclinic crystal system and space group P 21/n with a=1.1464(4) nm, b=0.6285(2) nm, c=2.1175(8) nm, β=111.06°(5), V=1.4236 nm, z=4. Compound (Ⅱ) crystallized in triclinic crystal system and space group P 1 with a=0.8129(3) nm, b=1.0371(2) nm, c=1.0762(3) nm, a=64.86°(2), β=83.97°(2), γ=80.43°(2), V=0.8094 nm, Z=2. The crystal structures were solved by direct method and refined by block matrix least square program. The final R factors are 0.039 for compound (Ⅰ) and 0.052 for compound (Ⅱ). The CNDO/2 calculations were applied for both compounds.The compound (Ⅱ) was given evidence of the tranquil activity and low toxicity in mice.