[EN] PROCESS FOR THE PREPARATION OF 4 -SUBSTITUTED -1, 4-DIHYDROPYRIDINES<br/>[FR] PROCÉDÉ POUR LA PRÉPARATION DE 1,4-DIHYDROPYRIDINES SUBSTITUÉES EN POSITION 4
申请人:ARCH PHARMALABS LTD
公开号:WO2012123966A1
公开(公告)日:2012-09-20
4-Substituted-l,4-dihydropyridines of formula I are prepared by a cycloaddition reaction in which the cyclization is driven to completion at ambient temperature optionally in water without any catalyst. For exemplary purposes, the invention is described in particular detail with respect to the preparation of felodipine of formula II. Felodipine, a vasodilator, is prepared by a cycloaddition reaction of alkyl 3- aminocrotonate with dichlorobenzylidene under reaction conditions whereby the product crystallizes out of the reaction solution and may be directly isolated by filtration.
Addition reactions of heterocyclic compounds. Part 71. The formation of 1,3a,3b,4,6a,6b-hexahydrocyclopenta[3,4]cyclobuta[1,2-b]pyrroles from dimethyl acetylenedicarboxylate and 1-aryl-1,4-dihydropyridines
作者:R. Morrin Acheson、Andrew R. D. Knott、David J. M. Lucas、Peter A. Tasker、Giuseppe Paglietti
DOI:10.1039/p19800000081
日期:——
1-Aryl-1,4-dihydropyridines combine with dimethyl acetylenedicarboxylate to form tetramethyl 1-aryl-1,3a,3b,4,6a,6b-hexahydrocyclopenta[3,4]cyclobuta[1,2-b]pyrrole-3,3a,6,6a-tetracarboxylates, the structures of which were deduced from their 1H, 13C n.m.r., and mass spectra. The mode of formation of the adducts is discussed.
1-芳基-1,4-二氢吡啶与乙酰二羧酸二甲酯结合形成四甲基1-芳基-1,3a,3b,4,6a,6b-六氢环戊[3,4]环丁[1,2 - b ]吡咯-3, 3a,6,6a-四羧酸盐,其结构是根据其1 H,13 C nmr和质谱得出的。讨论了加合物的形成方式。
Long acting formulation
申请人:SYNTEX (U.S.A.) INC.
公开号:EP0301133A2
公开(公告)日:1989-02-01
A long acting sustained release pharmaceutical composition for dihydropyridine calcium channel blockers wherein the calcium channel blocker and a pH-dependent binder are intimately admixed in essentially spherically shaped non-rugose particles of up to 1.2 mm in diameter.
Medicament for inhibiting onset of or treating migraine headaches employing an ace inhibitor
申请人:E.R. Squibb & Sons, Inc.
公开号:EP0331803A2
公开(公告)日:1989-09-13
A method is provided for inhibiting onset of or treating migraine headache by administering an ACE inhibitor, such as captopril, alone or in combination with a calcium channel blocker such as diltiazem or nifedipine, over a prolonged period of treatment.
Process for the preparation of 4-substituted-1,4-dihydropyridines
申请人:MERCK & CO. INC.
公开号:EP0534520A2
公开(公告)日:1993-03-31
4-Substituted-1,4-dihydropyridines are prepared by a cycloaddition reaction in which the cyclization is driven to completion, after thermal reaction, by addition of an acid. Felodipine, a vasodilator, is prepared by a cycloaddition reaction of ethyl 3-aminocrotonate with a suitably substituted dichlorobenzylidine under reaction conditions whereby the product crystallizes out of the reaction solution and may be directly isolated by filtration.