Synthesis and pharmacological properties of 1-alkyl-3,4-tetramethylene-β-carbolines

Translated from Khimiko-farmatsevticheskii Zhurnal, Vol. 23, No. 6, pp. 675–678, June, 1989.     

Synthesis of amides of 2-(3,3,7-trimethyl-3,4-dihydroisoquinolyl-1)ethanoic acid and their effects on arterial blood pressure

The reaction of 2-methyl-1-(p-tolyl)propanol-2 with N-alkyl-, N-benzyl-, and N-arylcyanacetamides was used to synthesize 2-(3,3,7-trimethyl-3,4-dihydroisoquinolyl-1)ethanoic acid amides. Investigations showed that tertiary amides formed from cyclic amines (morpholine, piperidine, etc.) had hypertensive actions, while all the other amides had hypotensive effects). The most active compound decreased arterial pressure by 46 mmHg and the duration of action was 90 min. Translated from Khimiko-Farmatsevticheskii Zhurnal, Vol. 43, No. 1, pp. 5–7, January, 2009.     

Synthesis and antiinflammatory and analgesic activity of amidines of 3,4-dihydroisoquinoline series

A series of substituted 1-arylamino-3,4-dihydroisoquinolines have been synthesized using reactions of 1-methylthio-3,3-dimethyl-3,4-dihydroisoquinolines with substituted anilines and 2-aminothiazoles. The products were tested for analgesic and antiinflammatory activity. __________ Translated from Khimiko-Farmatsevticheskii Zhurnal, Vol. 39, No. 10, pp. 27–29, October, 2005.     

Phramacological properties of esters of 1-alkyl-2-hydroxyalkylpyrrolidine and their quaternary derivatives

A series of esters of 1-alkyl-2-hydroxyalkylpyrrolidine and their quaternary derivatives have been shown to possess significant anti-acetylcholine activity. The benzilic acid esters were the most active, followed by xanthene-9-carboxylic acid, fluorene-9-carboxylic acid and diphenylacetic acid esters in that order. The quaternary derivatives were more active than their corresponding tertiary compounds both in vivo and in vitro. The most active compound of the series tested in vivo was (1-methylpyrrolid-2-yl)methyl benzilate methiodide and was as potent as atropine. There was a progressive decrease in anti-acetylcholine activity and a proportional increase in local anaesthetic activity as the number of carbon atoms was increased from 1 to 3 in the pyrrolidyl side-chain of the tertiary salts of the benzilic acid ester series. Likewise increasing the size of the group on the nitrogen atom led to a decrease in anti-acetylcholine activity and an increase in local anaesthetic activity. Quaternization of the tertiary salts resulted in a loss of local anaesthetic activity. Most of the compounds tested possessed some antihistamine properties, while papaverine-like activity was confined to the tertiary salts only. No significant neuromuscular blocking activity was evident.     

Pharmacological properties of esters of 1-alkyl-2-hydroxyalkylpyrrolidine and their quaternary derivatives

A series of esters of 1-alkyl-2-hydroxyalkylpyrrolidine and their quaternary derivatives have been shown to possess significant anti-acetylcholine activity. The benzilic acid esters were the most active, followed by xanthene-9-carboxylic acid, fluorene-9-carboxylic acid and diphenylacetic acid esters in that order. The quaternary derivatives were more active than their corresponding tertiary compounds both in vivo and in vitro. The most active compound of the series tested in vivo was (1-methylpyrrolid-2-yl)methyl benzilate methiodide and was as potent as atropine. There was a progressive decrease in anti-acetylcholine activity and a proportional increase in local anaesthetic activity as the number of carbon atoms was increased from 1 to 3 in the pyrrolidyl side-chain of the tertiary salts of the benzilic acid ester series. Likewise increasing the size of the group on the nitrogen atom led to a decrease in anti-acetylcholine activity and an increase in local anaesthetic activity. Quaternization of the tertiary salts resulted in a loss of local anaesthetic activity. Most of the compounds tested possessed some antihistamine properties, while papaverine-like activity was confined to the tertiary salts only. No significant neuromuscular blocking activity was evident.     

Synthesis and anti-inflammatory activity of 1-acylaminoalkyl-3,4-dialkoxybenzene derivatives

New 1-acylaminoalkyl-3,4-dialkoxybenzene derivatives 17-31 were synthesized by the acylation of amines 9-16 with acyl chlorides. Amines 9-16 were obtained from aryl ketones 1-8. Aryl ketones 1-8 were synthesized by the acylation of corresponding aromatic compounds. As it was preliminary predicted by PASS (Prediction of Activity Spectra for Substance) program, all 1-acylaminoalkyl-3,4-dimethoxy- and 3,4-diethoxybenzene derivatives possess anti-inflammatory activity. Activity of compounds 18, 19, 21, 24, 26, 27, 28, 29 was similar to that of acetylsalicylic acid or ibuprofen however their acute toxicity was less than that of mentioned anti-inflammatory drugs. A series of 1-acylaminoalkyl-3,4-dimethoxybenzene, 1-acylaminoalkyl-3,4-diethoxybenzene and 6-acylaminoalkyl-2,3-dihydro-1,4-benzodioxine derivatives have been synthesized. These compounds possess moderate or strong anti-inflammatory activity and low toxicity.     

Synthesis and antimicrobial activity of some new 1-alkyl-2-alkylthio-1,2,4-triazolobenzimidazole derivatives

Some new derivatives of 1,2,4-triazolo[2,3-a]benzimidazoles were synthesized through the reaction of 1,2-diaminobenzimidazole with carbon disulfide. The resulting 1,2,4-triazolo-[2,3-a]benzimidazole-2-thione intermediate was reacted with one equivalent of alkyl halides to give the corresponding 2-alkylthio derivatives, which were further alkylated through the reaction with another one equivalent of different alkyl halides to afford the target compounds; 1-alkyl-2-alkylthio-1,2,4-traizolo[2,3-a]benzimidazoles. On the other hand, the 1,2-disubstituted derivatives with two identical alkyl substituents were prepared by the reaction of 1,2,4-triazolo[2,3-a]benzimidazole-2-thione with two equivalents of the alkyl halides. The structures of the new compounds were assigned by spectral and elemental methods of analyses. The synthesized compounds were tested for their antibacterial and antifungal activities. Most of the tested compounds proved comparable results with those of ampicillin and fluconazole reference drugs. The study indicated that, the antibacterial as well as the antifungal activities of the test compounds were improved with increase in the bulkiness of the introduced alkyl groups. Also, some active antibacterial compounds were tested for their antimycobacterial activity. All the test compounds showed equipotent antitubercular activity as that of INH as a reference drug.     

Synthesis of 1-aroylmethyl-and 1-aryloxymethyl-3,4-dihydroisoquinolines and their effects on blood clotting

Acylation of a number of tertiary enamines with aroylchlorides was used to synthesize 1-aroylmethyl-3,4-dihydroisoquinolines. Reaction of 1-chloromethyl-3,3-dimethyl-3,4-dihydroisoquinoline with phenols with interphase catalysis was also used to make 1-aryloxymethyl-3,4-dihydroisoquinoline derivatives. 1-Aroylmethylisoquinolines characteristically had a hemostatic effect, while 1-aryloxymethyl-3,4-dihydroisoquinolines had an anticoagulant effect. The most active compound increased blood clotting by 17.7%. __________ Translated from Khimiko-Farmatsevticheskii Zhurnal, Vol. 42, No. 2, pp. 18–20, February, 2008.     

阿魏酸衍生物的合成及抗血小板聚集活性

以具有活血化瘀作用的中药有效成分阿魏酸为先导物,设计合成了6个阿魏酸衍生物,其结构经IR、1H NMR、13C NMR及MS确证。体内药效筛选结果显示,阿魏酸衍生物对二磷酸腺苷(ADP)诱导的血小板聚集具有较好的抑制活性,其抑制作用明显强于阳性对照药奥扎格雷钠。     

Synthesis of 1-N-aryloacetamidobutanol derivatives with anti-seizure effect

New derivatives of 1-N-aryloacetamidobutanols were obtained in the reaction of arylalkylcarboxylic acid chlorides with R, S, R(-), S(+) 1-amino-2-butanols. Structures of the obtained compounds have been confirmed by elemental analysis and IR-spectrometry. Results of pharmacological studies will be published elsewhere.