Selective and facile electroreductive synthesis of dihydro- and tetrahydropyridine dicarboxylic acid derivatives
摘要:
Electroreduction of pyridinedicarboxylic acid derivatives in methanol using a divided cell brought about highly selective hydrogenation to give efficiently the corresponding dihydropyridines in good yields. From the electrolysis of dimethyl 2,3- and 2,5-pyridinedicarboxylates, 1,2-dihydropyridine derivatives were obtained while that of 2,6-, 3,4- and 2,4-disubstituted pyridines afforded the corresponding 1,4-dihydropyridines selectively in good yields. (C) 1999 Elsevier Science Ltd. All rights reserved.
Regioselective photochemical cycloaddition of enamine-carbaldehydes and alkenes; synthesis of 1,4-Dihydropyridines and 2-hydroxy-1,2,3,4-tetrahydropyridines
作者:Lutz F. Tietz、Andreas Bergmann、Klaus Brüggemann
DOI:10.1016/s0040-4039(00)88173-3
日期:1983.1
Selective and facile electroreductive synthesis of dihydro- and tetrahydropyridine dicarboxylic acid derivatives
Electroreduction of pyridinedicarboxylic acid derivatives in methanol using a divided cell brought about highly selective hydrogenation to give efficiently the corresponding dihydropyridines in good yields. From the electrolysis of dimethyl 2,3- and 2,5-pyridinedicarboxylates, 1,2-dihydropyridine derivatives were obtained while that of 2,6-, 3,4- and 2,4-disubstituted pyridines afforded the corresponding 1,4-dihydropyridines selectively in good yields. (C) 1999 Elsevier Science Ltd. All rights reserved.
TIETZE, L. F.;BERGMANN, A.;BRUEGGEMANN, K., TETRAHEDRON LETT., 1983, 24, N 34, 3579-3582
作者:TIETZE, L. F.、BERGMANN, A.、BRUEGGEMANN, K.
DOI:——
日期:——
Highly selective and facile synthesis of dihydro- and tetrahydropyridine dicarboxylic acid derivatives using electroreduction as a key step
Electroreduction of pyridinedicarboxylic acid derivatives la-g in methanol containing ammonium chloride using a divided cell brought about highly selective hydrogenation to give the corresponding dihydropyridines in good yields. From the electrolysis of dimethyl 2,3- and 2,5-pyridinedicarboxylates 1a,c, only the corresponding 1,2-dihydropyridine derivatives 2a,e were obtained in a regioselective manner while that of 2,4-, 2,6-, and 3,4- disubstituted pyridines 1b,d,e afforded the corresponding 1,4-dihydropyridine 2b,d,e selectively in good yields. Further hydrogenation of the resultant dihydropyridines by several methods led to the selective and facile formation of the corresponding tetrahydropyridines 6. Furthermore, Mg-promoted hydrosilylation of the N-acetylated product 5a gave C-silylated tetrahydropyridines in a stereoselective manner. (C) 2001 Elsevier Science Ltd. All rights reserved.