6-甲氧基-2-(4-甲氧苯基)苯并[b]噻吩及其异构体的合成研究

目的 合成盐酸雷洛昔芬关键中间体6-甲氧基-2-(4-甲氧苯基)苯并Lb]噻吩。方法 以4-甲氧基苯乙酮为原料，经溴代、硫醚化先制得α-(3—甲氧苯硫基)-4-甲氧基苯乙酮，再在多聚磷酸(PPA)的催化下，经环合及重排制得目标产物。结果 与结论从目标产物母液中分离得到3个异构体，它们的化学结构根据高分辨质谱、核磁共振氢谱与红外光谱测试数据确认。改用甲硝酸为催化剂，可提高目标产物的收率。     

(R,S)-N-(1-乙氧羰基)-3-苯丙基-L-丙氨酸的合成

(S)-苹果酸经羟基保护并脱水得(S)-2-乙酰氧基丁二酸酐,经傅-克酰化反应、钯炭催化还原后成乙酯得(S)-2-羟基-4-苯丁酸乙酯,与三氟甲磺酸酐成酯后,与L-丙氨酸苄酯发生取代反应,最后氢化脱苄制得(R,S)-N-(1-乙氧羰基)-3-苯丙基-L-丙氨酸,总收率约30％.     

3-(5-甲氧基-1,5-二氧代戊基)-(4S)-苯基噁唑烷-2-酮的制备

依折麦布(ezetimibe),化学名为(3R,4S)-1-(4-氟苯基)-3-[(3S)-3-(4-氟苯基)-3-羟丙基]-4-(4-羟苯基)-2-氮杂环丁酮,是由先灵葆雅和默克公司联合研发的新型胆固醇吸收抑制剂,2002年11月首次在德国上市,2007年8月在我国上市,临床主要用于治疗高胆固醇血症~[1].3-(5-甲氧基-1,5-二氧代戊基)-(4S)-苯基噁唑烷-2-酮(1)是合成依折麦布的重要中间体.     

维生素B1催化合成1-(3-甲氧基-4-丙氧基-5-硝基苯基)-4-(3,4,5-三甲氧基苯基)-1,4-二酮

研究以NaCN和维生素B1为催化剂合成MK-287的关键中间体1-(3-甲氧基-4-丙氧基-5-硝基苯基)-4-(3，4，5-三甲氧基苯基)-1，4-二酮（1）的催化效果。结果表明：维生素B1较文献报道的催化剂ETB具有反应时间短、成本低廉的优点，可代替ETB合成目的化合物。     

3-(S)-(-)-(1-氨甲酰基-1,1-二苯甲基)吡咯烷酒石酸盐的制备

以L-苹果酸(2)为原料,经与苄胺缩合、还原、氢解脱苄、磺酰化、烷基化、脱保护基、水解后成盐制得氢溴酸达非那新关键中间体3-(S)-(-)-(1-氨甲酰基-1,1-二苯甲基)吡咯烷酒石酸盐,总收率约22%(以2计).     

1-氧代-1-(6-甲氧基-2-萘基)-2-溴丙烷的合成

通过滴加溴化铜的甲醇溶液,６－甲氧在－２－丙酰萘在均相体系中回流,可高选择性地溴化,得到合成非甾体消炎镇痛药萘普生的关键中间体１－氧代－１－（６－甲基氧－２－萘基）－２溴丙烷,收率９２．８％。     

(2S,3R)-1-二甲氨基-3-(3-甲氧基苯基)-2-甲基戊-3-醇的合成工艺研究

目的 对(2S,3R)- 1-二甲氨基-3-(3-甲氧基苯基)-2-甲基戊-3-醇合成工艺进行研究.方法 以3-戊酮为起始原料,经Mannich反应、手性拆分、Grignard反应等步骤合成(2S,3R)-1-二甲氨基-3-(3-甲氧基苯基)-2-甲基戊-3-醇,并对化学拆分进行工艺优化.结果 合成(2S,3R)-1...     

(R,S)-2-氨基丙醇的制备

氯丙酮经乙酸基化、碱性水解、Raney Ni催化还原胺化得到（R，S）-2-氨基丙醇，总收率44％。     

(2S, 3S)-3-氨基-2-羟基-4-苯丁酰胺的合成

目的 合成α-酮基酰胺肽类钙蛋白酶抑制剂的必需结构片段 (2S, 3S)-3-氨基-2-羟基-4-苯丁酰胺（1）。 方法 以(S)-2-氨基-3-苯丙醇为起始原料,经过苄基保护、Parikh-Doering 氧化、氰化水解、酰胺化和脱保护共5步反应合成目标化合物。结果与讨论 目标化合物和中间体的结构均经1H-NMR和13C-NMR谱确证,该合成路线方法简捷,适于大量制备。     

Stereochemical aspects of parachloroamphetamine metabolism: Rabbit liver microsomal metabolism of RS-, R(-)-, and S(+)-para-chloroamphetamine

With the aid of a chiral derivatizing reagent and a sensitive and specific nitrogen-phosphorus gas Chromatographic assay, metabolism of para-chloroamphetamine (PCA) enantiomers has been studied following incubation of racemic (RS)-, R(?) and S(+)-PCA with rabbit liver microsomal preparations. Significant metabolism of racemic PCA and the individual enantiomers was observed following incubation in rabbit liver microsomal preparations. Metabolism required viable microsomes, NADPH and molecular oxygen, and the rate of metabolism increased following pretreatment with phenobarbital. Incubation of racemic PCA resulted in more rapid metabolism of the S(+) enantiomer than of the R(?) enantiomer. When the enantiomers were incubated individually, each enantiomer was metabolized more rapidly than when incubated as part of a racemic mixture, and the R(?) enantiomer was metabolized more rapidly than the S(+) enantiomer.     

L-2-(N-叔丁氧酰基)-3′,4′-二甲氧基苯丙氨酸乙酯的合成

目的：改进L-2-（N-叔丁氧酰基）-3′,4′-二甲氧基苯丙氨酸乙酯的合成工艺。方法：以左旋多巴为起始原料,采用“半分离纯化”的制备方法进行合成,并对处理工艺进行优化。结果：通过此法制备步骤简单,后处理容易,可有效减少原料及中间体的氧化程度。总收率达到45．4％。结论：这是一种易于操作、适合规模化生产的制备工艺。     

西司他丁中间体(+)-(S)-2,2-二甲基环丙羧酸的合成

目的:合成( )-(S)-2,2-二甲基环丙羧酸.方法:以2,2-二甲基环氧乙烷和三乙基膦醋酸酯为原料,经Witting环化生成三元环制备外消旋2,2-二甲基环丙羧酸,用L-(-)-薄荷醇为拆分试剂拆分得到光学活性目标化合物.结果:成功合成出( )-(S)-2,2-二甲基环丙羧酸,拆分收率提高到26.8%.结论:此方法操作简便,成本较低,收率较高,适于大量生产.     

Design,synthesis, and biological evaluation of 4-methoxy-3-arylamido-N-(substitutedphenyl)benzamide derivatives as potential antiplatelet agents

A series of 4-methoxy-3-arylamido-N-(substitutedphenyl)benzamides 6a – u were designed according to the splicing principle of structural design in the medicinal chemistry theory and were synthesized in five steps: nitration, acylation, ammoniation, reduction, and secondary ammoniation. The structures of the target compounds were characterized and verified by infrared, ¹H nuclear magnetic resonance (NMR), ¹³C NMR, and electron spray ionization spectroscopy. Their in vitro antiplatelet aggregation activities induced by adenosine diphosphate (ADP) or arachidonic acid (AA) were assessed by Born's method. The biological evaluation revealed that all compounds exhibited certain levels of activities in both of the antiplatelet aggregation assays; compounds 6c (IC₅₀ = 3.84 μM) and 6f (IC₅₀ = 3.12 μM) displayed the strongest antiplatelet aggregation activities in the ADP-induced and AA-induced assay, separately. Moreover, compounds that had stronger activities were chosen for cell toxicity testing via the cell counting kit-8 assay. The results indicated that none of the compounds had obvious cell toxicity against L929 cells at the doses of 10 and 20 μM. It is worth pointing out that compound 6c showed the highest antiplatelet activity and the lowest cell toxicity. In general, 4-methoxy-3-arylamido-N-(substitutedphenyl)benzamides have the potential to become a kind of safer and more effective antiplatelet agents.     

Induction of neurite outgrowth by (-)-(7R, 8S)-dihydrodehyd-rodiconiferyl alcohol from PC12 Cells

A lignan derivative, (-)-(7R, 8S)-dihydrodehydrodiconiferyl alcohol (DHDA), was isolated from Kalopanax septemlobus L. and was observed to have neuritogenic activity. DHDA at 50 microM caused a marked induction of neurite outgrowth and an enhancement of nerve growth factor (NGF)-mediated neurite outgrowth from PC12 cells. However, it did not exhibit any neurotrophic action. At 50 microM, DHDA enhanced NGF-induced neurite-bearing activity. This activity was partially blocked by the mitogen-activated protein kinase (MAPK) inhibitor PD98059 and by GF109203X, a protein kinase C (PKC) inhibitor. These results suggest that DHDA can induce neurite outgrowth and enhance NGF-induced neurite outgrowth from PC12 cells by amplifying up-stream steps such as MAPK and PKC.     

(2R,4R)-4-甲基-2-哌啶甲酸乙酯的合成工艺改进

目的 优化(2R,4R)-4-甲基-2-哌啶甲酸乙酯的合成工艺.方法 以S-(-)-α-甲基苄胺为原料,与乙醛酸乙酯反应得到[(S)-1-苯乙基亚胺基]乙酸乙酯,与异戊二烯进行环合后,再经不对称氢化和脱保护反应制得(2R,4R)-4-甲基-2-哌啶甲酸乙酯.结果 总收率从17.0％提高至47.6％.结论 本工艺可有效地降低生产成本.     

(3R,5S)-6-氧代-3,5-O-亚异丙基-3,5-二羟基己酸叔丁酯的合成

L-（-）-苹果酸经酯化、还原、羟基保护、缩合、羰基还原、羟基保护、脱硅保护和Swern氧化等反应制得罗伐他汀的关键中间体（3R，5S）-6-氧代-3,5-O-亚异丙基-3，5-二羟基己酸叔丁酯，总收率25％。     

An efficient synthesis of 3-(E)-hydroxypropenyl cephem derivatives, key intermediates for 3-(E)-ammoniopropenylcephalosporin antibiotics

An efficient synthesis of 3-(E)-hydroxy- and 3-(E)-acetoxypropenylcephem derivatives, key intermediates for the synthesis of 3-(E)-propenylcephalosporins was achievedvia Stille coupling reaction of 3-trifloxycephem with 3-(E)-tributylstannylallylic alcohol.     

6-取代苯基-3(2H)哒嗪酮的合成、抗惊活性及其构效关系的研究

本文报道了14个6-取代苯基-4,5-二氢-3(2H)哒嗪酮和15个6-取代苯基-3(2H)哒嚎酮的合成及其抗电惊活性。其ED₅₀值表明,以2′,4′-二氯苯基-3(2H)哒嗪酮的抗惊作用为最强。构效分析表明,苯环上的取代基对化合物的抗惊活性有明显影响,吸电子取代基和疏水性参数值较大的取代基有利于提高化合物的抗惊活性。     

复方氨基酸胶囊(8-11)治疗血液病化疗后肝损害的疗效观察

目的:观察复方氨基酸胶囊(8-11)治疗血液病化疗后肝损害的疗效。方法:60例化疗后引起肝损害的血液病患者随机分为治疗组(30例)与对照组(30例),治疗组化疗后给予硫普罗宁肠溶片200mg+复方氨基酸胶囊(8-11)700mg,口服,3次.d-1;对照组化疗后仅给予硫普罗宁肠溶片200mg,口服,3次.d-1。2组疗程均为4wk,比较2组治疗前、后肝功能水平。结果:治疗组肝功能改善及白蛋白水平提高明显优于对照组(P<0.05)。结论:复方氨基酸胶囊(8-11)对血液病化疗后肝损害疗效显著。