Bioorganic and medicinal chemistry p. 1291 - 1303 (2002)
Update date:2022-08-02
Topics:
Giardina, Dario
Crucianelli, Mauro
Angeli, Piero
Buccioni, Michela
Gulini, Ugo
Marucci, Gabriella
Sagratini, Gianni
Melchiorre, Carlo
A series of beta-chloroethylamines 5--18, structurally related to the irreversible alpha(1)-adrenoceptor antagonist phenoxybenzamine [PB, N-benzyl-N-(2-chloroethyl)-N-(1-methyl-2-phenoxyethyl)amine hydrochloride, 1] and the competitive antagonist WB4101 [N-(2,3-dihydro-1,4-benzodioxin-2-ylmethyl)-N-[2-(2,6-dimethoxyphenoxy)ethyl]amine hydrochloride, 2], were synthesized and evaluated for their activity at alpha-adrenoceptors of the epididymal and the prostatic portion of young CD rat vas deferens. All compounds displayed irreversible antagonist activity. Most of them showed similar antagonism at both alpha(1)- and alpha(2)-adrenoceptors, whereas compounds 13 and 18, lacking substituents on both the phenoxy group and the oxyamino carbon chain, displayed a moderate alpha(1)-adrenoceptor selectivity (10--35 times), which was comparable to that of PB. Compounds 14 and 15, belonging to the benzyl series and bearing, respectively, a 2-ethoxyphenoxy and a 2-i-propoxyphenoxy moiety, were the most potent alpha(1)-adrenoceptor antagonists with an affinity value similar to that of PB (pIC(50) values of 7.17 and 7.06 versus 7.27). Interestingly, several compounds were able to distinguish two alpha(1)-adrenoceptor subtypes in the epididymal tissue, as revealed by the discontinuity of their inhibition curves. A mean ratio of 24:76 for these alpha(1)-adrenoceptors was determined from compounds 8--10, 12, and 15--17. Furthermore, compounds 9, 10, 12, 16a, and 16b showed higher affinity towards the minor population of receptors, whereas compounds 8, 15, and 17 preferentially inhibited the major population of alpha(1)-adrenoceptors. In addition, selected pharmacological experiments demonstrated the complementary antagonism of the two series of compounds and their different, preferential affinity for one of the two alpha(1)-adrenoceptor subtypes. In conclusion, we found beta-chloroethylamines that demonstrate a multiplicity of alpha(1)-adrenoceptors in the epididymal portion of young CD rat vas deferens and, as a consequence, they are possible useful tools for alpha(1)-adrenoceptor characterization.
View MoreShanghai Chemchallenger Biotech Co., Ltd.
Contact:0086-21-68110815
Address:Room 2056, Building 1, No. 1065, Jiaxin Road Shanghai China (Mainland) 201800
website:http://www.weichichem.com
Contact:+8613912949432
Address:Fine Chemical Industrial Base,Wujiang town,He County,Anhui China.
Jiande City Silibase Silicone New Material Manufacture Co., Ltd.
Contact:15967177856
Address:Genglou Industrial Development Area
Taizhou Chenyi chemical co. LTD,
Contact:13736652831
Address:NO.273 SHANGHAI SOUTH STREET,LUQIAO DISTRICT,ZHEJIANG PROVINCE,CHINA.
Dayang Chem (Hangzhou) Co.,Ltd.
website:http://www.dycnchem.com
Contact:+86-571-88938639
Address:9/F, Unit 2 Changdi Torch Building, 259# WenSan Road, Xihu District, Hangzhou City 310012, P.R.China
Doi:10.1021/jp021000j
(2002)Doi:10.1002/anie.200460696
(2004)2 (R = Me or Ph)
Doi:10.1039/DT9930000477
(1993)Doi:10.1021/jo101699r
(2011)Doi:10.1134/S1070363217090237
(2017)Doi:10.1021/j100372a077
(1990)