New derivatives of boronic acid, the process for producing said derivatives and the pharmaceutical compound that contain them

Abstract From the Canadian patent

Formula compound (I): (see fig. I) where: R1 R2, identical or different, represent an atom of hydrogen or an alkyl group or else R1 and R2 form with the carbon atom that holds them a cycloalkyl group R3 represents an atom of hydrogen or an alkyl phenyl or benzyl group R4 represents: -an eventually substituted amino group eventually substituted amidino group, eventually substituted guanidino group eventually substituted isothioureido group eventually substituted iminomethylamino group mercapto substituted by an heterocyclic or heterocyclic, group R5, R6 each represent an atom of hydrogen or an alkyl group or (see fig. II) form a pinanediol boronic ester m representing an integer such as 0