Practical synthesis and regioselective alkylation of methyl 4(5)-(pentafluoroethyl)-2-propylimidazole-5(4)-carboxylate to give DuP 532, a potent angiotensin II antagonist
摘要:
DuP 532 (2), which is a potent angiotensin II receptor antagonist, has been prepared by two different routes. One route, which is more practical for large-scale synthesis, required the preparation of methyl 4(5)-(pentafluoroethyl)-2-propylimidazole-5(4)-carboxylate (9). This imidazole was synthesized in five steps from commercially available 11 in 32% overall yield. Alternate perfluoroalkylation methods of the iodoimidazole precursor 14 are presented. Imidazole 9 is remarkably stable to basic conditions and is alkylated by 2-[N-(triphenylmethyl)tetrazol-5-yl]-4'-(bromomethyl)-1,1'-biphenyl (8), giving only the desired regioisomer. A comparison of the alkylation of the trisubstituted precursors and analogues to 9 with 8 indicate that even under mildly basic conditions (K2CO3/DMF), the mechanism is S(E)2cB (anionic), except for 2-propyl-4(5)-(hydroxymethyl)imidazole (11) which alkylates as a neutral species (S(E)2').
Practical synthesis and regioselective alkylation of methyl 4(5)-(pentafluoroethyl)-2-propylimidazole-5(4)-carboxylate to give DuP 532, a potent angiotensin II antagonist
摘要:
DuP 532 (2), which is a potent angiotensin II receptor antagonist, has been prepared by two different routes. One route, which is more practical for large-scale synthesis, required the preparation of methyl 4(5)-(pentafluoroethyl)-2-propylimidazole-5(4)-carboxylate (9). This imidazole was synthesized in five steps from commercially available 11 in 32% overall yield. Alternate perfluoroalkylation methods of the iodoimidazole precursor 14 are presented. Imidazole 9 is remarkably stable to basic conditions and is alkylated by 2-[N-(triphenylmethyl)tetrazol-5-yl]-4'-(bromomethyl)-1,1'-biphenyl (8), giving only the desired regioisomer. A comparison of the alkylation of the trisubstituted precursors and analogues to 9 with 8 indicate that even under mildly basic conditions (K2CO3/DMF), the mechanism is S(E)2cB (anionic), except for 2-propyl-4(5)-(hydroxymethyl)imidazole (11) which alkylates as a neutral species (S(E)2').
Fused aryl substituted imidazole angiotensin II receptor inhibitors
申请人:E. I. Du Pont de Nemours and Company
公开号:US05254546A1
公开(公告)日:1993-10-19
Substituted imidazoles such as ##STR1## which are useful as angiotensin II receptor inhibitors. These compounds have activity in treating hypertension and congestive heart failure.
Substituted imidazoles such as ##STR1## are useful as angiotensin II blockers. These compounds have activity in treating hypertension and congestive heart failure.