Cyclic nitromethyl acetic acid derivatives

C - Chemistry – Metallurgy – 07 – C

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C07C 205/51 (2006.01)

Patent

CA 2498186

The invention provides salts of formula (I) wherein X is a basic counterion selected from a group I or group II metal and a primary, secondary or tertiary amine; n is 0, 1 or 2; and Rl, Rla, R2, R2a, R3, R3a, R4 and R4a are independently selected from H and C1-C6 alkyl, or R1 and R2 or R2 and R3 are taken together to form a C3-C7 cycloalkyl ring, which is optionally substituted with one or two substituents selected from C1-C6 alkyl, which are useful as intermediates in the preparation of cyclic and bicyclic amino acids. Processes for the preparation of the final products and for the conversion of the compounds of formula (.IOTA.) to amino acids are included.

L'invention concerne des sels représentés par la formule (I), dans laquelle X représente un contre-ion basique sélectionné entre un métal du groupe I ou II et une amine primaire, secondaire ou tertiaire ; n égale 0, 1 ou 2 ; et R?1¿, R?1a¿, R?2¿, R?2a¿, R?3¿, R?3a¿, R?4¿ et R?4a¿ sont sélectionnés indépendamment entre H et alkyle en C¿1?-C¿6?, ou R?1¿ et R?2¿ ou R?2¿ et R?3¿ forment ensemble un noyau cycloalkyle en C¿3?-C¿7?, qui est éventuellement substitué par un ou deux substituants sélectionnés dans le groupe des alkyles en C¿1?-C¿6?. Ces composés sont utiles comme produits intermédiaires dans la préparation d'acides aminés cycliques et bicycliques. L'invention comprend également des procédés permettant de préparer les produits finaux et de transformer les composés représentés par la formule (I) en acides aminés.

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