消旋棉酚拆分的研究——Ⅱ.手性α-甲基苯乙胺及α-甲基苄胺为拆分剂

本文报道用中压柱色谱快速分离S或R-α-甲基苯乙胺及S或R-α-甲基苄胺缩(±)-棉酚的方法,可得光学活性胺缩( )或(一)-棉酚非对映体,经水解分别得到( )或(一)-棉酚。并证明胺缩光学活性棉酚非对映体之间有互相转化的性质,此特性可利用于棉酚对映体的转化。     

消旋棉酚拆分的研究——Ⅳ.苏(-)或(+)-1-(对硝基苯基)-1,3-二羟基丙胺-2为拆分剂

本文介绍以光学活性苏-1-(对硝基苯基)-1,3-二羟基丙胺-2为拆分剂,与消旋棉酚缩合,用常压柱色谱或溶剂结晶法分离得到两个光学纯的非对映体,然后分别水解得(+)和(-)-棉酚。     

从天然植物制取(一)棉酚

本文首次报道从天然植物——海岛棉籽中分离出(-)棉酚。同时发现了受试的各种棉籽所含棉酚的光学活性的规律。(1)棉籽中棉酚的两个对映体(-)棉酚和(+)棉酚一般是不等量的,故其成分应为(±)棉酚和过量的(-)棉酚或(+)棉酚;(2)同种属棉籽含有相同旋光性的过量对映体,如海岛棉籽均含有过量的(-)棉酚,多数品种所含棉酚的光学纯度为10～25%,陆地棉籽则均含有过量的(+)棉酚,其相应棉酚的光学纯度为10～20%。     

消旋棉酚拆分的研究——Ⅳ.苏(-)或( )-1-(对硝基苯基)-1,3-二羟基丙胺-2为拆分剂

本文介绍以光学活性苏-1-(对硝基苯基)-1,3-二羟基丙胺-2为拆分剂,与消旋棉酚缩合,用常压柱色谱或溶剂结晶法分离得到两个光学纯的非对映体,然后分别水解得( )和(-)-棉酚。     

(-)和(+)棉酚对雄大鼠生育力的影响

棉酚有明显的抗雄性生育作用,但在理论上尚不清楚消旋棉酚的抗生育作用和毒性来自那一种光学异构体。已有报告指出(+)棉酚无毒无效。但对(-)棉酚的研究迄今尚未有报道。本文应用本所合成室制备之(+)和(-)棉酚,观察了他们的抗生育作用。实验用Wistar雄大鼠(190～220g)25只,分为对照,(+)棉酚30mg/kg,(-)棉酚15和30 mg/kg以及消旋棉酚30 mg/kg等5组。每天喂药1次,(+)棉酚和(-)棉酚     

消旋棉酚拆分的研究——Ⅲ.胺缩棉酚理化性质的研究

本文报道消旋棉酚与15种不同结构的光学活性胺缩合产物的薄层色谱性质和核磁共振氢谱数据,以及8个光学活性胺与光学活性棉酚缩合物的光学稳定性,并探讨了结构与这些性质的关系。     

消旋棉酚拆分的研究——Ⅲ.胺缩棉酚理化性质的研究

本文报道消旋棉酚与15种不同结构的光学活性胺缩合产物的薄层色谱性质和核磁共振氢谱数据,以及8个光学活性胺与光学活性棉酚缩合物的光学稳定性,并探讨了结构与这些性质的关系。     

3-甲基芬太尼立体异构体的合成、绝对构型和镇痛活性

报道3-甲基芬太尼(2)四个光学异构体的合成及其绝对构型的确定,并测定了各异构体的镇痛活性(小鼠,ip,热板法)。结果表明,cis-(+)-(3R,4S)-2的镇痛作用最强,ED_(50)0.00767 mg/kg,镇痛效能是吗啡的2600倍,比其对映体cis-(-)-(3S,4R)-2以及混旋的cis-(±)-2分别强119和1.5倍;trans-(+)-(3S,4S)-2的镇痛效能是吗啡的450倍、trans-(-)-(3R,4R)-2的4倍。     

18-甲基炔诺酮中间体的拆分

D-及L-18-甲基炔诺酮是以消旋19-去甲基13β-乙基-3β,17β-双羟基17α-乙炔基-4-雄甾烯(Ⅲ)为原料,经Ⅲ的丁二酸单醋与(+)α-甲基苯乙胺成盐,然后分离,分别水解,氧化即得D-左旋18-甲基炔诺酮(Ⅶa)和L-右旋18-甲基炔诺酮(Ⅶb)。如用(—)α-甲基苯乙胺,首先得L-构型的右旋18-甲基炔诺酮(Ⅶb),而母液中的D-左旋体未进行分离。     

光学活性的α-甲基丁酰基间苯三酚类化合物绝对构型与旋光方向的关系及其合成

合成了14个新化合物,其中有12个是(S)-(+)-α-甲基丁酰基间苯三酚类化合物。通过对新化合物旋光资料的研究和分析,找到了它们绝对构型与旋光方向的关系。该规律在测定光学活性的α-甲基丁酰基间苯三酚类化合物的绝对构型和开发研究该类药物上,均具有一定的实际应用价值。     

消旋棉酚晶态结构的研究

目的:研究消旋棉酚晶形结构。方法:采用红外光谱(IR)、差示扫描量热法(DSC)、测定溶解度和粉末X射线衍射法(XRD)来研究消旋棉酚晶态结构。结果:消旋棉酚[(±)G]、左旋棉酚[(-)G]和右旋棉酚[(+)G]的红外谱图基本相同;DSC图谱及热特征数据不一致;在消旋棉酚的饱和溶液中加入光学活性棉酚,光学活性棉酚可以继续溶解,并且有旋光产生;(±)G与(-)G及(+)G的XRD图完全不同。结论:消旋棉酚晶体属于外消旋化合物。     

(-)和(+)棉酚对雄大鼠生育力的影响

Racemic, (-) and (+) gossypol, provided by the Department of Organic Chemistry of our institute, was suspended in 2.5% tween 80 solution. Adult male Wistar rats 190～220 g in weight were allotted to 5 groups. Animals in group 1 received 2.5% tween 80 solution as control. Rats in group 2 were treated with racemic gossypol at the dosage of 30 mg/kg for 2 weeks. Animals in group 3 and 4 were given 15 mg/kg of (-) gossypol for 2 weeks and 30 mg/kg of (-) gossypol for 1 week respectively. Rats in group 5 were treated with (+) gossypol at the dosage of 30 mg/kg for 2 weeks.Four weeks from the beginning of gossypol treatment the rats were cohabited with adult females for 7 days. Then the motility of the sperms in the cauda epididymides was estimated The female rats were examined for pregnancy 7 days later.Treatment with (-) gossypol at 30 mg/kg caused significant decreases in body weight of the rats (P<0.05). One of the five rats died 7 days after the last administration, while (+) gossypol and racemic gossypol at the dosage employed had no effect on the body weight. (+) Gossypol at 30 mg/kg for 2 weeks had no effect on the motility of the sperms in the cauda epididymides and no effect on the fertility of the animals: nor was there any effect on the weights of the testis, epididymis, prostate and seminal vesicle. The sperms of the cauda epididymides were found to be dead in the groups treated with 15 and 30 mg/kg of (-)gossypol. Raccmic gossypol given for 2 weeks at 30 mg/kg caused loss of fertility of the male rats which confirmed our previous findings.(?)t may be postulated that (+) gossypol has no antifertility effect nor toxicity at the dosage employed. (-) Gossypol is the active stereoisomer of racemic gossypol.     

Formation of deaminated products in styrene oxide reactions with deoxycytidine.

The reaction of racemic styrene oxide with deoxycytidine under aqueous conditions was studied. The four principal products isolated were a pair of diastereomeric N(4)-(2-hydroxy-1-phenylethyl)deoxycytidines ( approximately 20% of the products) and a pair of diastereomeric 3-(2-hydroxy-2-phenylethyl)deoxyuridines ( approximately 80% of the products). Reactions with optically active styrene oxides allowed the configurations of the 3-(2-hydroxy-2-phenylethyl)deoxyuridines to be assigned, and these structures were confirmed by an independent synthesis from deoxyuridine. Also, it was possible to tentatively assign the configurations of the N(4)-(2-hydroxy-1-phenylethyl)deoxycytidines that had undergone some racemization during the reaction (the ratio of the retained to inverted configuration of the products was approximately 1:7).     

Synthesis and properties of optically active organoantimony compounds

The chemistry of chiral ligands for transition metal-catalyzed asymmetric reactions is an interesting research field in synthetic chemistry and has recently been the focus of much attention. Although a number of chiral ligands containing phosphorus (P) and arsenic (As) have been widely studied and are well documented, asymmetric reactions with optically active organoantimony compounds have not been reported so far. We are interested in the synthesis and utilization of optically active organoantimony compounds for asymmetric synthesis. We present here the synthesis and resolution of Sb-chiral and C2-symmetric compounds containing antimony as well as their physical and chemical properties. Resolution of (+/-)-1-phenyl-2-trimetylsilylstibindole (1), Sb (R/S)-(aryl) [2-(S)-(1-dimethylaminoethyl) phenyl] (p-tolyl) stibane (9), and (+/-)-2,2'-bis(diarylstibano)-1,1'-binaphthyl (13) can be achieved by the separation of a mixture of the diastereomeric antimony-palladium complexes. The optically pure Sb-chiral stibanes (1, 9) isolated here were optically stable, and no racemization on the chiral antimony center was observed even when they were heated under a neutral or a basic condition. Single-crystal X-ray analysis of Sb-chiral triarylstibane 9b-B revealed the presence of an intramolecular interaction between the antimony and nitrogen atoms. The optically active BINASb (13) can be used as powerful chiral ligand for the palladium-catalyzed asymmetric allylic alkylation of racemic 1,3-diphenyl-2-propen-1-yl acetate with dimethyl malonate. We also report the synthesis, molecular structure, and fluxional behavior of the (R)-(-)-7-p-tolyl-dinaphtho [2, 1-b; 1',2'-d] stibole (21c) which is the first isolated example of optically active C2-symmetric group 15 dinaphthoheteroles.     

Asymmetrische reduktive Aminierung von Cycloalkanonen, 11. Mitt.1,2): Synthese optisch aktiver 2-substituierter Cycloheptanamine

Asymmetric Reductive Amination of Cycloalkanones, XI^1,2): Synthesis of Optically Active 2-Substituted Cycloheptanamines Asymmetric synthesis of 2-substituted cycloheptanamines from racemic cycloheptanones by means of reductive amination in a three-step procedure is described. Condensation of the ketones 1 with the optically active auxiliary R-(+)- or S-(-)-1-phenylethylamine leads to the imine mixtures 2 which are hydrogenated over Raney nickel to give the optically active, diastereomerically pure secondary amines 3 . Hydrogenolysis with Pd/C yields the optically active cis-2-substituted cycloheptanamines 4 .     

Acylanilide, 1. Mitt.: Synthese der Racemate und Enantiomere chiraler Acylanilide

Acylanilides, I: Syntheses of the Racemates and Enantiomers of Chiral Acylanilides The racemic and optically active cyanoacetyl chlorides 1 – 4 (R = Cl) or – in the presence of DCC – cyanoacetic acids 1 – 4 (R = OH) were reacted with p-phenetidine or 4-hydroxyaniline to give a series of racem. and optically active cyanoacyl anilides. With alkaline hydrogen peroxide 1a and 3a are converted to the malonic monoamide anilides 1c and 3c . The cyanoacyl anilide 2a was hydrogenated with high yield to 2-(aminomethyl)-2-isopropyl-4′-ethoxyvalerianyl anilide (2d) . The acyl anilides are to be tested pharmacologically.     

THE SYNTHESIS OF N-BENZYLOXYCARBONYL-L-PROLYL-DEHYDROPHENYLALANYL-L-HISTIDYL-L-LEUCINE

The direct oxidation of a dipeptide azlactone (1) by DDQ affords an optically active unsaturated dipeptide azlactone (2). It was shown that the double bond had the Z-configuration and that no racemization of the proline moiety occurred during the oxidation. The dehydrotripeptide, Z-Pro-ΔPhe-Phe ˙ OH (9b) was prepared by direct coupling of azlactone (2) with phenylalanine tetramethyl-guanidinium salt and was shown to be stable to chymotrypsin. The tetrapeptide, Z-Pro-ΔPhe-His-Leu ˙ OH (11), was prepared directly from the azlactone (2) and by saponification of the tetrapeptide ester (10) prepared by mixed anhydride coupling of Z-Pro-ΔPhe ˙ OH (7) with the dipeptide ester. The dehydropeptide (11) inhibits angiotensin I converting enzyme (IC₅₀, 1 × 10^-4 M).