Process for the preparation of [2-((8,9)-...

C - Chemistry – Metallurgy – 07 – F

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C07F 9/40 (2006.01) C07F 9/645 (2006.01)

Patent

CA 2297411

This invention relates to a process for the preparation of formula (I) compound [2-((8,9)-dioxo-2,6-diazabicyclo[5.2.0]-non-1(7)-en-2-yl)ethyl]phosphonic acid, an NMDA antagonist useful as an anticonvulsant and neuroprotectant in situations involving excess release of excitatory amino acids. In the process of the present invention, 3-aminopropyl carbamic acid 1,1-dimethyl-ethyl ester is reacted with a dialkyl vinylphosphonate to obtain N-[3-(t-butyloxycarbonyl-amino)propyl]-2-aminoethylphosphonic acid dialkyl ester (d) in 80 % yield. Reaction of (d) with a 3,4-dialkoxycyclobut-3-en-1,2-dione gives [3-[[2-(dialkoxyphosphoryl)ethyl]-(2- alkoxy-3,4-dioxo-l,2-cyclobuten-1-yl)amino]propyl] carbamic acid 1,1-dimethylethyl ester (e) in 96 % yield. Deprotection and cyclization of (e) in trifluoroacetic acid gives [2-((8,9)-dioxo-2,6-diazabicyclo[5.2.0]-non-1(7)-en-2-yl)ethyl]phosphonic acid dialkyl ester (c) in 58 % yield. The phosphonic acid diethyl ester (c) was treated with bromotrimethylsilane to give compound (I).

La présente invention concerne un procédé de préparation du composé de formule (1), un acide [2-((8,9)-dioxo-2,6-diazabicyclo[5.2.0]-none-1(7)-ène-2-yl)éthyl]phosphonique, un antagoniste NMDA utilisé comme agent anticonvulsivant et neuroprotecteur dans des situations dans lesquelles se produit une libération excessive d'acides aminés excitateurs. Selon le procédé de la présente invention, on met à réagir un 1,1-diméthyl-éthyl ester d'acide 3-aminopropyl carbamique avec un dialkyl vinylphosphonate pour un obtenir un dialkyl ester d'acide N-[3-(t-butyloxycarbonyl-amino)propyl]-2-aminoéthylphosphonique (d) avec un rendement de 80 %. La réaction de (d) avec une 3,4-dialcoxycyclobut-3-ène-1,2-dione donne un 1,1-diméthyl ester d'acide [3-[[2-(dialcoxyphosphoryl)éthyl]-(2-alcoxy-3,4-dioxo-1,2-cyclobutène-1-yl)amino]propyl]carbamique (e) avec un rendement de 96 %. La déprotection et la cyclisation de (e) en acide trifluoroacétique donne un dialkyl ester d'acide [2-((8,9)-dioxo-2,6-diazabicyclo[5.2.0]-none-1(7)-ène-2-yl)éthyl]phosphonique (c) avec un rendement de 58 %. On traite le diéthyl ester d'acide phosphonique (c) avec du bromotriméthylsilane pour obtenir le composé (1).

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