ES432474A1 - PROCEDURE FOR THE PREPARATION OF NEW BIPHENYL DERIVATIVES. - Google Patents

Abstract

Procedure for the preparation of new biphenyl derivatives of the general formula I, **(See formula)** wherein the radical R1 signifies a halogen atom and the radical B signifies the hydroxy group, an alkoxy or aralkoxy group or a group of the formula (see formula), in which R3 and R4, which may be the same or different from each other, represent hydrogen atoms, the carboxymethyl radical, a lower alcohol radical or a phenyl radical possibly substituted by a hydroxy or methyl group, and, in the case of that B means the hydroxy group, of its salts with organic or inorganic bases, characterized in that they undergo diazoketones of the general formula II **(See formula)** wherein the radical is as defined above, in the presence of water to form the corresponding carboxylic acid, in the presence of alcohols to form the corresponding esters, and in the presence of primary or secondary amines to form the corresponding amides of the general formula I; and the eventually obtained racemates are split by fractional crystallization of their salts with optically active bases into their two individual optically active components, and if desired, compounds obtained from the general formula I, in which B means the alkoxy group, are saponified to forming compounds of the general formula I, in which B represents the hydroxy group, and if desired, compounds obtained from the general formula I in which B is the hydroxy group, are transformed according to methods per se usual in their esters or in their salts by means of organic or inorganic bases or, if desired, for the preparation of compounds of the general formula I, in which B means the radical (see formula), a compound of the general formula I, in which B represents an alkoxy group or a halogen atom, is reacted with a primary or secondary amine at elevated temperatures. (Machine-translation by Google Translate, not legally binding)