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    • 39. 发明授权
    • Process for the synthesis of 4-(2-pyridylamido ethyl) piperidines
    • 合成4-(2-吡啶基酰氨基乙基)哌啶的方法
    • US3933830A
    • 1976-01-20
    • US504826
    • 1974-09-10
    • Wayne E. BarthDonald E. Kuhla
    • Wayne E. BarthDonald E. Kuhla
    • A61K31/445C07D213/82C07D401/12C07D211/02
    • C07D213/82A61K31/445C07D401/12Y10S514/866
    • Disclosed herein is an improved process for the preparation of known hypoglycemic piperidinesulfamylureas of the structure ##EQU1## wherein R is selected from the group consisting of 3-(2-methoxy)pyridyl, 3-(2-ethoxy)pyridyl and 2-(4-chloro)pyridyl and R' is selected from the group consisting of bicyclo[2.2.1]hept-5-en-2-yl-endo-methyl, bicyclo[2.2.1]hept-2-yl-endo-methyl, 7-oxabicyclo[2.2.1]hept-2-yl-methyl, 1-adamantyl and cycloalkyl having from five to eight carbon atoms.Said process comprises contacting 4-(2-pyridyl-amidoethyl) piperidine of the structure ##EQU2## with substantially one equivalent of sulfamide thereby exclusively sulfonating the piperidine nitrogen atom. Said 4-(2-pyridylamidoethyl)piperidines from the corresponding 4-(2-pyridylamidoethyl) pyridines by selectively activating the more basic nitrogen atom of said pyridine compound either by N-alkylation or by contact with acid and then exclusively reducing the activated pyridine ring with either hydrogen alone or in combination with a metal hydride. Said 4-(2-pyridylamidoethyl)pyridines are produced by contacting 4-(2-aminoethyl)pyridine with a pyridyl acid chloride of the formula R(C=O)Cl. The piperidine sulfonamides produced by the process of the instant invention are converted to the desired hypoglycemic agent by methods well-known to those skilled in the art.The 4-(2-pyridylamidoethyl)pyridines and piperidines of the instant invention are themselves novel compounds useful as intermediates in the synthesis of piperidine sulfamylurea hypoglycemic agents.
    • 本文公开了一种改进的制备以下结构的已知降血糖哌啶磺酰胺的制备方法:OO PARALLEL PARALLEL R-CNH(CH 2)2 -SO 2 NHC-NHR',其中R选自3-(2-甲氧基)吡啶基,3 - (2-乙氧基)吡啶基和2-(4-氯)吡啶基,R'选自双环[2.2.1]庚-5-烯-2-基 - 内 - 甲基,双环[2.2。 1]庚-2-基 - 内 - 甲基,7-氧杂双环[2.2.1]庚-2-基 - 甲基,1-金刚烷基和具有5-8个碳原子的环烷基。