A therapeutic agent for diseases caused by abnormal calcium metabolism

摘要

PCT No. PCT/FI90/00163 Sec. 371 Date Feb. 3, 1992 Sec. 102(e) Date Feb. 3, 1992 PCT Filed Jun. 19, 1990 PCT Pub. No. WO90/15806 PCT Pub. Date Dec. 27, 1990.Novel pharmaceutically active bisphosphonic acid derivatives of formula (I), in which R1, R2, R3 and R4 independently are C1-C22 -alkyl, C2-C22-alkenyl, C2-C22-alkynyl, C3-C10-cycloalkyl, C3-C10-cycloalkenyl, aryl, aralkyl, silyl and hydrogen, and R4 is different from hydrogen, Q1 is hydrogen, fluorine, chlorine, bromine or iodine, and Q2 is chlorine, bromine or iodine, including the stereoisomers, such as the geometrical isomers and optically active isomers, of the compounds, as well as the pharmaceutically acceptable salts of the compounds. IMAGE (I)